He doesn't know _____ his father is so worried about him 为什么

He doesn't know _____ his father is so worried about him 为什么 he doesn't know --his father is so worried about him. is the fact _____ he doesn't know his birthday _____ surpris He is worried about him .划分句子成分 He doesn't know the answer,so he doesn't put up his hand(改为虚 He is worried about him .about him 做什么成分 Tom's dog is ill.He looks worried and doesn't know（） he doesn't know the answer,so he can't put up his hand 同义句是什 Doesn't he take after his father! He doesn't care about what doesn't concern him. He doesn't know ____ about Africa. He told me,"his father doesn't know Mr.Brown"变为含宾语从句的复合句