David (not be)with us today ,because he (be) ill yesterday.
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David (not be)with us today ,because he (be) ill yesterday. (用所给动词的适当形式填空)
David (isn't)with us today ,because he (was) ill yesterday
再问: 括号里的是动词原形,是让把括号里的词根据一个适当形式填空,改完没括号
再答: David isn't with us today ,because he was ill yesterday. 那就去掉括号吧,这里是考be的变形 现在时:be-is(对第三人称单数)/am(第一人称单数I)/are(其他人称) 过去时:be-was(单数)/were(第二人称即其他)
再问: 括号里的是动词原形,是让把括号里的词根据一个适当形式填空,改完没括号
再答: David isn't with us today ,because he was ill yesterday. 那就去掉括号吧,这里是考be的变形 现在时:be-is(对第三人称单数)/am(第一人称单数I)/are(其他人称) 过去时:be-was(单数)/were(第二人称即其他)
David (not be)with us today ,because he (be) ill yesterday.
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