举例说明
可用于过去完成时和将来完成时
1.I
had
finished
the
work
by
the
time
he
came
back
2.We
will
have
finished
the
work
by
the
time
he
comes
back
正如上面所举的所举的
是要用完成时
但需注意
句子前后时态应保持一致
举例说明
可用于过去完成时和将来完成时
1.I
had
finished
the
work
by
the
time
he
came
back
2.We
will
have
finished
the
work
by
the
time
he
comes
back
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