作业帮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
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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
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
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
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.
1.would leave过去将来时
2.were serving表示一段时间内正在进行的动作，说话时不一定说话时正在发生。
would leave(过去完成时，would是will的过去式)
were serving(根据前后文推断)
这家伙ps都会使，这两题不会做？1.was leaving2.served
ps. 第一题是我不知道他们什么时候会去北京。主句是过去时，所以从句用过去将来时
pps
第二句和第一句是对应，考得是过去一般现在时
以上回答都对……我没什么说的了