some times&some time&sometimes&sometime 它们之间的区别与意思.和在什么时候分别用

some times 几次
some time 一段时间
sometimes 有时
sometime 某个时候
I have been to Beijing some times.
我去过北京几次.
After we had haggled for some time,we decided to the bargain,and Jones bought the cloth for50 pence per yard.
我们在价钱上争论了半天,终于决定,琼斯以每码50便士买下了这批布.
Mr.Smith sometimes condescends to help his wife with the housework.
史密斯先生有时屈尊帮他的妻子做家务.
I hope to see you again sometime next year.
我希望明年某一时候再见到你.