lily has some ideas about what she is going to be when she grows up 为什么用what 不用that

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lilyhassomeideasaboutwhatsheisgoingtobewhenshegrowsup为什么用what不用thatlilyhassomeideasaboutwhatsheisgoi

lily has some ideas about what she is going to be when she grows up 为什么用what 不用that
lily has some ideas about what she is going to be when she grows up 为什么用what 不用that

lily has some ideas about what she is going to be when she grows up 为什么用what 不用that
what的意思是:什么(职业)
that没有这个意思

what she is going to be 她打算当什么,what引导的名词性从句做about的宾语
不能用that来引导这个句子,它只能引导一个完整的句子做名词性从句,但she is going to be 并不是个完整句。

what 和 that 都可以引导从句,不同的是what 可以充当句子成分,不可以省略。that 不充当句子成分,可以省略。
本句中what做be 的表语,意为什么什么的事物,所以不能省略,若换成that ,没有这个意思,句子意思就不完整。所以要用what。

about 后面的部分为she is going to be 是宾语从句,在宾语从句里to be缺宾语,所以用what来引导宾语从句。这句话翻译为:莉莉对她长大以后会成为什么有一些想法。