David had a cold yesterday.改成否定句.david()()a cold yesterday.

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David had a cold yesterday.改成否定句.david()()a cold yesterday.

David had a cold yesterday.改成否定句.david()()a cold yesterday.
David had a cold yesterday.改成否定句.david()()a cold yesterday.

David had a cold yesterday.改成否定句.david()()a cold yesterday.
由had和yesterday得知体现一般过去时,故借助组动词did
David didn't have a cold yesterday.(did已经体现一般过去时,故had还原为原形have)

David had a cold yesterday.改成否定句.david (didn't) (have) a cold yesterday.

答案:【didn't have 】

大卫昨天没有感冒.
did后面的动词要用原型
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