谁能给我说过去完成时的用法及构成

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谁能给我说过去完成时的用法及构成谁能给我说过去完成时的用法及构成谁能给我说过去完成时的用法及构成过去完成时haddone时间标志bylastyear/bythetimeof过去完成时一般和过去时一起出

谁能给我说过去完成时的用法及构成
谁能给我说过去完成时的用法及构成

谁能给我说过去完成时的用法及构成
过去完成时 had done
时间标志
by last year/by the time of
过去完成时一般和过去时一起出现
sb had done sth before sb did
sb did sth after sb had done
用于hardly when,no sooner than的句式中
we had hardly came home when it rained.
用在“It was the first/second...time+that”句型中