作业帮for和since的用法
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for和since的用法
for和since的用法
for和since的用法
for +一段时间
since +句子
since +一段时间+ ago
since +时间点
例如 he has been dead for three years
he has been dead since three years ago
He has studied English since 2003
He has studied English since he was ten years old
很简单。
since+时间点/ 句子, for+时间段
1 I have been here for about 10 years.
2 I have been here since 10 years ago
3 I have been here since I was 10 years old.
4 I have been here since 2001
for+时间段since+时间点
简单理解是for+一段时间
since +时间点
eg：for two days
since two days ago
since 加时间翻译为自从多久以来 for加时间翻译为已经有多久了
FOR加时间段，SINCE加时间点。
如：He has been here for five years.
He has been here since five yeas ago.
for与表示一段时间的短语连用
for与一般过去时连用，表示一段终结了的时间
for与现在完成时连用表示延续到现在的一段时间
since +过去一个时间点
since +一段时间+ ago
since +从句
It is +一段时间+ since从句
since与某一时刻连用，表示从那一时刻到说话时为止，它总是与完成时态连用 ...
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for与表示一段时间的短语连用
for与一般过去时连用，表示一段终结了的时间
for与现在完成时连用表示延续到现在的一段时间
since +过去一个时间点
since +一段时间+ ago
since +从句
It is +一段时间+ since从句
since与某一时刻连用，表示从那一时刻到说话时为止，它总是与完成时态连用
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