they haven't decided to when they will start. 这句话是一个宾语从句,有错吗,

they haven't decided to when they will start. 这句话是一个宾语从句,有错吗,

decide to do sth 是词组 简单句..这里你不需要to 这里decide引导的是宾语从句 复合句 知道么 不懂可以问~

to去掉，或改成They haven't decided when to start.

有，应该是They haven't decided when they will start.为什么要把to去掉呢，不是decide to do sth 吗因为后面接一个句子作它的宾语，而不是动词不定式作宾语那么，什么叫介宾呢，不是动词+介词+宾语从句吗decide 是及物动词，后可直接接宾语，不必用介词那也可以说 decide do sth吗？？...

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有，应该是They haven't decided when they will start.

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