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by now (so far),
once, twice…,
just,
recently
ever, never,
all one’s life ,
in /during the past /last 5 years,
大显身手
1. I _________ (have) lunch already.
2. Has the train_______ (arrive), yet?
3.Tome ____ never (be to ) China.
4. The twin _____just _____ (see) my father.
5. The twins ____(see) my father just now.
6. Many tall buildings ____________(build) in the past 5 years.
have had
arrived
has
has
seen
have been built
saw
been to
用法二：
for+一段时间
since+时间的点
since+句子（过去时）
E.g. Kate has lived here for 3 years.
Kate has lived here since 3 years ago.
Kate has lived here since she came to China.
表示过去某个时间开始的动作或存在的状态，一直持续到现在并可能还将持续下去。动词使用延续性动词。常与for或since引导的时间连用