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用所给词的适当形式填空1、I didn't know when they (leave) for BeiJing.2/He said that they (serve) his parents at home.PS：注明讲解
题目详情
用所给词的适当形式填空
1、I didn't know when they (leave) for BeiJing.
2/He said that they (serve) his parents at home.
PS：注明讲解
1、I didn't know when they (leave) for BeiJing.
2/He said that they (serve) his parents at home.
PS：注明讲解
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答案和解析
这两句话都含有宾语从句.宾语从句的时态取决于主句的谓语动词,有个小口决“主现从任意,主过从过去”意思是：主句的谓语动词是现在时态的范畴,从句的谓语动词可以根据需要用任何时态；主句的谓语动词是过去时态的范畴,从句的谓语动词要用过去时.
这两个句子的主句谓语动词都是过去时,则从句要根据需要选用过去时态.
1.would leave 据题意,他们还没有去北京,据前面所说要用过去将来时
2.were serving 进行时,据上文要用过去进行时.
这两个句子的主句谓语动词都是过去时,则从句要根据需要选用过去时态.
1.would leave 据题意,他们还没有去北京,据前面所说要用过去将来时
2.were serving 进行时,据上文要用过去进行时.
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