时态
动词形式（以work举例）
标志词
一般现在时
work,works(三人称单数加s,es)
often
everyday,always...
一般过去式
worked
yesterday,last
week/month...
一般将来时
will
work
tomorrow,
next
week/year...
现在进行时
is/are
working
now,
at
thistime,listen,look...
过去进行时
was/were
working
at
this
time
yesterday...
过去将来时
would
work
现在完成时
has/have
worked
since,
for+时间
过去完成时
had
worked
以play
为例
一般现在时：plays
一般过去时：played
现在进行时：is/am/are+
playing
过去进行时：was/were+
playing
一般将来时：shall/will
+play
过去将来时：should/would+play
现在完成时：has/have+played
过去完成时：had+played
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