改病句:the firemen could not found the people.

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改病句:the firemen could not found the people.

改病句:the firemen could not found the people.
改病句:the firemen could not found the people.

改病句:the firemen could not found the people.
found→find

the firemen could not find the people.
could 后一定要加动词的原型,原句中为过去式found所以错。

情态动词(can, must,might 等等)后面加动词原形,所以原句是
the firmen could not find the people.

could是情态动词,后面用动词原型,所以把found改成find.