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【答案】
【1】 I did my homework last night.
【2】Mike had lunch at school yesterday.
【3】Did Tom walk to school last week?
【4】How old were you last year?
【5】He is reading a book now.
【解析】
【1】句意:我现在正在做作业。last night昨晚,改写后句子为一般过去时态,谓语动词要用过去式,do的过去式是did,故答案为I did my homework last night.。
【2】句意:迈克经常在学校吃午饭。yesterday昨天,改写后句子为一般过去时态,谓语动词要用过去式,has的过去式是had,故答案为Mike had lunch at school yesterday.。
【3】句意:汤姆每天步行上学吗?last week上周,改写后句子为一般过去时态,助动词要用过去式,does的过去式是did,在句首首字母要大写,故答案为Did Tom walk to school last week?
【4】句意:你多大了?last year去年,改写后句子为一般过去时态,be动词are要用过去式,are的过去式是were,故答案为How old were you last year?
【5】句意:他昨天读了一本书。now现在,改写后句子为现在进行时,其构成为:主语+be+现在分词。因为主语是he,所以be动词用is,read的现在分词是reading,故答案为He is reading a book now.