he has studied English _______________.
a. since two years ago
b. for two years.
答案是b 可是a 哪里错了？ 为什么?
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He has been studying English since two years ago.
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第1个回答 2010-06-28
A确实是错了，应该用完成进行时。
建议你去买《无敌英语》的高中版，它的第一章对时态的讲解非常到位。还有就是，时态题不能光理解，英语是一门语言，你必须要读和背，培养起敏锐的语感。背多了你就可以秒杀单选了。建议你去买《天星四十五套》，做完了之后把单选那部分减下来，随时都背，就没多少问题了。
建议你去买《无敌英语》的高中版，它的第一章对时态的讲解非常到位。还有就是，时态题不能光理解，英语是一门语言，你必须要读和背，培养起敏锐的语感。背多了你就可以秒杀单选了。建议你去买《天星四十五套》，做完了之后把单选那部分减下来，随时都背，就没多少问题了。
第2个回答 2010-06-25
since的四种用法
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
完成时的句子也可以加for+一段时间表示在这段时间已近完成的动作
所以两句都没错本回答被提问者采纳
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
完成时的句子也可以加for+一段时间表示在这段时间已近完成的动作
所以两句都没错本回答被提问者采纳
第3个回答 2010-06-25
a不对！因为since是用在过去完成时have been doing sth，而has studied是用在have done（过去分词) sth现在完成时，我昨天才问的老师啊~~这类题我也曾经错了，现在完全明白了
第4个回答 2010-06-25
since 和ago不能连用啊同学
可以说since 2years before，或者直接english 2 years ago
可以说since 2years before，或者直接english 2 years ago
