八年级英语 用how long 问的 for与sine的区别

Question

急用~！！！！！！！！！！谢~！！！！！！！！！！！！！！

Answer 1

for加一段时间 表示一个时间段 比如 for 4 years
就是4年整
所以句中的动词也应该是延续性动词
since 的用法比较复杂
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. 从1989年至今

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.

Answer 2

答案是：
how
long
多长时间
用来提问
for
+时间段
或者是since
+时间点
（时间状语从句） how
soon
多久之后
用来提问
in+时间段
（用于一般将来时）
how
long
have
you
lived
in
beijing
?
how
soon
will
you
come
back
?

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