C. 现在完成时从不与when引起的疑问句联用。
D. have been to:去过…
have gone to:去了…
have been in:呆在…
E. 短暂性动词变为延续性动词:
buy --- have had borrow --- have kept
join --- have been in / have been a member of
become --- have been a member make friends --- have been friends
die --- have been dead get to know --- have known
come/go to do --- have done catch a cold --- have had a cold
begin/start to do --- have done
begin / start --- have been on
enter / come / arrive / get to / reach --- have been in/at
go / leave for / set off / set out --- have been away from
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