你可以直接说I
watched
a
sad
movie
last
night
不需要用which
is.
watch
a
movie
not
see
a
movie.
还有你应该说I
cried
when
I
was
watching
the
movie。
I
did
就是发生在过去的一件事对现在没有影响比如I
did
my
homework
last
night.
I
have
done是过去发生的一件事对现在有影响比如I
have
done
with
my
homework
from
yesterday
so
I
got
an
"A"
for
today's
grade.
所谓对现在有影响就是在句子后面加上现在发生的事。
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