I wanted to know.Is he doing his homework

I wanted to know.Is he doing his homework
练成含宾语从句的复合句

I wanted to know whether/if he was doing his homework.
再问： 为什么是doing不是did
再答： 你的原句中不是is he doing 吗？陈述就是he is doing（强调进行的） 如果改成did，意思就不一样了。 我想知道他是不是正在做作业。 过去想知道的，所以，都用过去。 I want to know whether he is doing his homework
再问： 那为什么是wanted
再答： 你问题中不是： I wanted to know 要不就是 I want to know whether he is doing his homework(表示现在想知道）

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