问题描述：
有些英语疑问,
He used to go fishing (这句话没有错吧),He is used to Beijing food(这句话也没错哈)
1.为什么前者加了BE动词,而后者没有加?麻烦讲下什么时候可以加,什么时候不用加.
These children have been studying English for 3 years.-- He has learned English since he came to our school
1.都是完成时,为什么前者要用have+been+dong 的结构,而后者要用has+learned?
2.可以把前者改成These children have learned English for 3 years?可以把后者改成He has been learnning Englishi since he came to our school?
3.,什么时候要用have+been+dong 的结构,什么时候要用类似has+learned的结构?该怎么用 .
He used to go fishing (这句话没有错吧),He is used to Beijing food(这句话也没错哈)
1.为什么前者加了BE动词,而后者没有加?麻烦讲下什么时候可以加,什么时候不用加.
These children have been studying English for 3 years.-- He has learned English since he came to our school
1.都是完成时,为什么前者要用have+been+dong 的结构,而后者要用has+learned?
2.可以把前者改成These children have learned English for 3 years?可以把后者改成He has been learnning Englishi since he came to our school?
3.,什么时候要用have+been+dong 的结构,什么时候要用类似has+learned的结构?该怎么用 .
问题解答：
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