作业帮had用于什么时态
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had用于什么时态
had用于什么时态
had用于什么时态
可以用于过去时,此时是动词,如 I had my dinner at 8.p.m. alone in the cafeteria.
再就是作为非谓语,可以是过去完成时had done,如 I had lost my book.
过去完成进行时had been doing如 I had been playing football since 7 years old.
做“有”的意思，可用于一般过去式，如I had a dog last year.去年我有一只狗。
用于过去完成式：如I had learned 500 words by the end of last week．到上周为 止我已学习了500个单词了。
had 是 have 的过去式和过去分词。