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happenedtodo为什么不是happenedtodidhappentodosth的过去式是happenedtodosth为什么不是happenedtodidsth难道不要保持时态一致吗?比如itsohappenedtoseehimonthestreet为什么不是itissohappendtos

题目详情
happened to do 为什么不是happened to did
happen to do sth 的过去式是 happened to do sth 为什么不是happened to did sth 难道不要保持时态一致吗?
比如 it so happened to see him on the street 为什么不是 it is so happend to saw him on the street
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回答:happen to do sth 中的to是动词不定式符号,即该符号后的动词一定要用动词原形,即happened to see him, 而不能是happened to saw him,.又如:He expected to see her soon.Last year I decided to change a job...