问题描述：
初二英语提问 明天期末考苦逼的孩纸一枚
现在完成时用法
join join in take part in 区别
过去进行时常用时间标志
when while as 常用语法
现在完成时用法
join join in take part in 区别
过去进行时常用时间标志
when while as 常用语法
问题解答：
我来补答
join,join in和take part in 有什么区别?
答：
1)join及物动词加入（团体,组织,参军）、同……一起干或玩、连接
例句：
①I joined the Party in 1975.
（我1975年入党.）
②His brother joined the army two years ago.
（两年前他哥哥参军.）
③They are planning to join the two towns by a railway.
（他们在计划用一条铁路把两个镇连接起来.）
2)join in
参加（某些活动）
例句：
①May I join in your discussion?
（我可以参加你们的讨论吗?）
②Many people join in the game every year.
（每年许多人参加这个游戏活动.）
③He joined in the work without a second thought.
（他未加思索地参加了那项工作.）
3)take part in
参加（群众性活动,会议等）参加者持积极态度,起一份作用.
例句：
①A lot of students took part in the thorough cleaning
yesterday.
（昨天许多学生参加大扫除.）
②A lot of college students took part in the movement last year.
（去年很多大学生参加了那个运动.）
when,while,as引导时间状语从句的区别 when,while,as显然都可以引导时间状语从句,但用法区别非常大. 一、when可以和延续性动词连用,也可以和短暂性动词连用；而while和as只能和延续性动词连用. ① Why do you want a new job when youve got such a good one already?（get为短暂性动词）你已经找到如此好的工作,为何还想再找新的? ②Sorry,I was out when you called me．（call为短暂性动词）对不起,你打电话时我刚好外出了. ③Strike while the iron is hot．（is为延续性动词,表示一种持续的状态）趁热打铁. ④ The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记. 二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生. 1．从句动作在主句动作前发生,只用 when. ①When he had finished his homework,he took a short rest．（finished先发生）当他完成作业后,他休息了一会儿. ②When I got to the airport,the guests had left．（got to后发生）当我赶到飞机场时,客人们已经离开了. 2．从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用. ①When ／While ／As we were dancing,a stranger came in．（dance为延续性动词）当我们跳舞时,一位陌生人走了进来. ②When ／While ／As she was making a phonecall,I was writing a letter．（make为延续性动词）当她在打电话时,我正在写信. 3．当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用 as.这时,as常表示“随着……”；“一边……,一边……”之意. ① As the time went on,the weather got worse．（as表示“随着……”之意） ② The atmosphere gets thinner and thinner as the height increases．随着高度的增加,大气越来越稀薄. ③As years go by,China is getting stronger and richer．随着时间一年一年过去,中国变得越来越富强了. ④The little girls sang as they went．小姑娘们一边走,一边唱. ⑤The sad mother sat on the roadside,shouting as she was crying．伤心的妈妈坐在路边,边哭边叫. 4．在将来时从句中,常用when,且从句须用一般时代替将来时. ①You shall borrow the book when I have finished reading it．在我读完这本书后,你可以借阅. ②When the manager comes here for a visit next week,Ill talk with him about this．下周,经理来这参观时,我会和他谈谈此事. 三、when用于表示“一……就……”的句型中（指过去的事情）. sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．． ①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼,就有人在敲门了. ②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我刚一走进房门,电话就响了
现在完成时用法
1.现在完成时不能单独与准确时间状语连用,（如表示过去的时间状语）
如yesterday(morning、afternoon),last(morning、afternoon）等,除非与for,since连用.
2.现在完成时往往同表示不确定的过去时间状语连用
如already（肯定,句中）,yet（否定,疑问,句中）,just,before,recently,still,lately,never等：
He has already obtained a scholarship.他已经获得了一份奖学金.
I haven't seen much of him recently (lately).我已经很久没有看到他（最近的）.
时态
We have seen that film before.我们以前已经看过那部电影了.
Have they found the missing child yet?他们找到失踪的孩子了吗?
3. 现在完成时态经常与表示频度的时间状语连用,
如often,sometimes,ever,never,twice,on several occasion等：
Have you ever been to Beijing?你以前去过北京吗?
I have never heard Bunny say anything against her.我从来没有听到Bunny说她的坏话.
I have used this pen only three times. It is still good.这支钢笔我只用过三次.它仍然是好的.
George has met that gentleman on several occasions.乔治已经在好几个场合见过那个先生几次.
4. 现在完成时还往往可以同包括现在时间在内的时间状语连用
如now,up to these few days/weeks/months/years,this morning/week/month/year,just,today,up to present,so far等：
Peter has written six papers so far.彼得写了六篇论文,到目前为止.
Man has now learned to release energy from the nucleus of the atom.人们现在已经学会了从原子核中释放能量.
There has been too much rain in San Francisco this year.今年以来旧金山雨水太多.
The friendly relations and cooperation between our two countries have been enhanced in the past few years.我们两国之间的友好合作关系在近几年得到了提高.
Up to the present everything has been successful.到现在为止一切都是成功的.
5.现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.
6.现在完成时的"完成用法"指的是动作发生在过去某一时刻并已结束.
例如：He has turned the light off .他已把灯关了.
现在完成时"完成用法"的特点是动作不延续,因此,该时态只能与表示不定的过去时间状语（如：already,yet,before,recently等）、频度时间状语（如：never,ever等）、包括现在时刻在内的时间状语（如：this morning / month /year...,today等）连用.
例如：Have you found your pen?你已经找到你的钢笔了吗?
7.现在完成时的"未完成用法"指的是动作开始于过去某一时刻,一直延续到现在,或可能还要继续下去.
例如：He has lived here since 1978.自从1978年以来,他一直住在这儿.（动作起始于1978年,一直住到现在,可能还要继续住下去.）
I have been in the army for more than 5 years.我在部队已经呆了五年多了.（动作开始于5年前,一直延续至今,有可能还要继续下去.）
此种用法的句中常需一个表示一段时间的状语（由since或for引导）,或表示与现在时刻相连的时间状语（如：up to now,so far）等.
例如：I have heard nothing from him up to now.到目前为止我没有他的任何消息.
注意：（1）现在完成时的未完成用法只适用于延续性动词,不可用于终止性动词,即瞬间完成或延续时间很短的动词.如：come,go,arrive,leave,join,become,die等.
8.一段时间+has passed+since从句
9.现在完成时常和短语 "up to now /till now","so far" （意思是从过去某一确定的时间一直延续到现在)连用.
Up to/till now he's read many story books. 至今他已读过好多故事书.
I've been to New York three times so far. 至今我已到纽约去过三次.
has gone (to),has been (to),has been (in) 的区别.
has gone to：表示某人已去了某地,而没有回来（去了没回）.
has been to ：表示去过某地（去过已回来）.
has been in：表示一直呆在某地, 常与时间段搭配（呆了很久）.
10.不可以与一般过去时的定义混淆
过去进行时常用时间标志
1,was+动词ing ,例如：I was watching TV(我过去正在看电视）2,were + 动词ing,例如：They were playing football.(他们过去正在踢足球 ）过去进行时表示在过去某一时刻或某一段时间内进行或发生的动作.其形式为was /were + V-ing.常与表示过去的时间状语连用,如：last night, last Saturday等；或者与when, while, as引导的过去时间状语连用.
如果对你有用的话,请采纳.O(∩_∩)O~
答：
1)join及物动词加入（团体,组织,参军）、同……一起干或玩、连接
例句：
①I joined the Party in 1975.
（我1975年入党.）
②His brother joined the army two years ago.
（两年前他哥哥参军.）
③They are planning to join the two towns by a railway.
（他们在计划用一条铁路把两个镇连接起来.）
2)join in
参加（某些活动）
例句：
①May I join in your discussion?
（我可以参加你们的讨论吗?）
②Many people join in the game every year.
（每年许多人参加这个游戏活动.）
③He joined in the work without a second thought.
（他未加思索地参加了那项工作.）
3)take part in
参加（群众性活动,会议等）参加者持积极态度,起一份作用.
例句：
①A lot of students took part in the thorough cleaning
yesterday.
（昨天许多学生参加大扫除.）
②A lot of college students took part in the movement last year.
（去年很多大学生参加了那个运动.）
when,while,as引导时间状语从句的区别 when,while,as显然都可以引导时间状语从句,但用法区别非常大. 一、when可以和延续性动词连用,也可以和短暂性动词连用；而while和as只能和延续性动词连用. ① Why do you want a new job when youve got such a good one already?（get为短暂性动词）你已经找到如此好的工作,为何还想再找新的? ②Sorry,I was out when you called me．（call为短暂性动词）对不起,你打电话时我刚好外出了. ③Strike while the iron is hot．（is为延续性动词,表示一种持续的状态）趁热打铁. ④ The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记. 二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和as从句的谓语动作必须是和主句谓语动作同时发生. 1．从句动作在主句动作前发生,只用 when. ①When he had finished his homework,he took a short rest．（finished先发生）当他完成作业后,他休息了一会儿. ②When I got to the airport,the guests had left．（got to后发生）当我赶到飞机场时,客人们已经离开了. 2．从句动作和主句动作同时发生,且从句动作为延续性动词时,when,while,as都可使用. ①When ／While ／As we were dancing,a stranger came in．（dance为延续性动词）当我们跳舞时,一位陌生人走了进来. ②When ／While ／As she was making a phonecall,I was writing a letter．（make为延续性动词）当她在打电话时,我正在写信. 3．当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用 as.这时,as常表示“随着……”；“一边……,一边……”之意. ① As the time went on,the weather got worse．（as表示“随着……”之意） ② The atmosphere gets thinner and thinner as the height increases．随着高度的增加,大气越来越稀薄. ③As years go by,China is getting stronger and richer．随着时间一年一年过去,中国变得越来越富强了. ④The little girls sang as they went．小姑娘们一边走,一边唱. ⑤The sad mother sat on the roadside,shouting as she was crying．伤心的妈妈坐在路边,边哭边叫. 4．在将来时从句中,常用when,且从句须用一般时代替将来时. ①You shall borrow the book when I have finished reading it．在我读完这本书后,你可以借阅. ②When the manager comes here for a visit next week,Ill talk with him about this．下周,经理来这参观时,我会和他谈谈此事. 三、when用于表示“一……就……”的句型中（指过去的事情）. sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．． ①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼,就有人在敲门了. ②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我刚一走进房门,电话就响了
现在完成时用法
1.现在完成时不能单独与准确时间状语连用,（如表示过去的时间状语）
如yesterday(morning、afternoon),last(morning、afternoon）等,除非与for,since连用.
2.现在完成时往往同表示不确定的过去时间状语连用
如already（肯定,句中）,yet（否定,疑问,句中）,just,before,recently,still,lately,never等：
He has already obtained a scholarship.他已经获得了一份奖学金.
I haven't seen much of him recently (lately).我已经很久没有看到他（最近的）.
时态
We have seen that film before.我们以前已经看过那部电影了.
Have they found the missing child yet?他们找到失踪的孩子了吗?
3. 现在完成时态经常与表示频度的时间状语连用,
如often,sometimes,ever,never,twice,on several occasion等：
Have you ever been to Beijing?你以前去过北京吗?
I have never heard Bunny say anything against her.我从来没有听到Bunny说她的坏话.
I have used this pen only three times. It is still good.这支钢笔我只用过三次.它仍然是好的.
George has met that gentleman on several occasions.乔治已经在好几个场合见过那个先生几次.
4. 现在完成时还往往可以同包括现在时间在内的时间状语连用
如now,up to these few days/weeks/months/years,this morning/week/month/year,just,today,up to present,so far等：
Peter has written six papers so far.彼得写了六篇论文,到目前为止.
Man has now learned to release energy from the nucleus of the atom.人们现在已经学会了从原子核中释放能量.
There has been too much rain in San Francisco this year.今年以来旧金山雨水太多.
The friendly relations and cooperation between our two countries have been enhanced in the past few years.我们两国之间的友好合作关系在近几年得到了提高.
Up to the present everything has been successful.到现在为止一切都是成功的.
5.现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.
6.现在完成时的"完成用法"指的是动作发生在过去某一时刻并已结束.
例如：He has turned the light off .他已把灯关了.
现在完成时"完成用法"的特点是动作不延续,因此,该时态只能与表示不定的过去时间状语（如：already,yet,before,recently等）、频度时间状语（如：never,ever等）、包括现在时刻在内的时间状语（如：this morning / month /year...,today等）连用.
例如：Have you found your pen?你已经找到你的钢笔了吗?
7.现在完成时的"未完成用法"指的是动作开始于过去某一时刻,一直延续到现在,或可能还要继续下去.
例如：He has lived here since 1978.自从1978年以来,他一直住在这儿.（动作起始于1978年,一直住到现在,可能还要继续住下去.）
I have been in the army for more than 5 years.我在部队已经呆了五年多了.（动作开始于5年前,一直延续至今,有可能还要继续下去.）
此种用法的句中常需一个表示一段时间的状语（由since或for引导）,或表示与现在时刻相连的时间状语（如：up to now,so far）等.
例如：I have heard nothing from him up to now.到目前为止我没有他的任何消息.
注意：（1）现在完成时的未完成用法只适用于延续性动词,不可用于终止性动词,即瞬间完成或延续时间很短的动词.如：come,go,arrive,leave,join,become,die等.
8.一段时间+has passed+since从句
9.现在完成时常和短语 "up to now /till now","so far" （意思是从过去某一确定的时间一直延续到现在)连用.
Up to/till now he's read many story books. 至今他已读过好多故事书.
I've been to New York three times so far. 至今我已到纽约去过三次.
has gone (to),has been (to),has been (in) 的区别.
has gone to：表示某人已去了某地,而没有回来（去了没回）.
has been to ：表示去过某地（去过已回来）.
has been in：表示一直呆在某地, 常与时间段搭配（呆了很久）.
10.不可以与一般过去时的定义混淆
过去进行时常用时间标志
1,was+动词ing ,例如：I was watching TV(我过去正在看电视）2,were + 动词ing,例如：They were playing football.(他们过去正在踢足球 ）过去进行时表示在过去某一时刻或某一段时间内进行或发生的动作.其形式为was /were + V-ing.常与表示过去的时间状语连用,如：last night, last Saturday等；或者与when, while, as引导的过去时间状语连用.
如果对你有用的话,请采纳.O(∩_∩)O~
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