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现在完成时句中常见的时间状语
非延续性动词和延续性动词的转换
leave — be away
borrow — keep
buy — have
begin/start — be on
die — be dead
finish --- be over
open sth — keep sth open
fall ill — be ill
get up—be up,
come here — be here,
join — be on +组织机构
/be a member 组织机构,
go there — be there, become — be,
come back—be back,
fall asleep — be asleep,
选择for或since填空：
I have been here _____five months ago.
2. He has been a soldier ____ about two months.
3. Great changes have taken place _____ you left.
4. His grandpa has been dead ____ ten years.
5. I have studied English ______ I was 12 years old.
since
for
since
for
since
1、The old man died 4 years ago.
2、He joined the Party 2 years ago.