when is Tom? He's left a message saying that he has something important to do.请问怎么翻译,特别是那个when ,不是什么时候是意思吗,在这里怎么翻译

Tom's mother looks ____(worry) when he is sick He is Tom's father.怎么问 monther's Tom's is when birthday(?)连词成句 What is Tom want to be when he grows up. He is Tom's brotherTom's brother提问 Tom is my father and he is my mother's( ) The happiest time of Tom's life is 空格 he helps others.空格处为什么一定要填写when而不是that?答案上是when. He often helps Tom when Tom is in trouble.将句子改成被动语态 He often helps Tom when Tom is in trouble. 这个句子的被动语态怎么改? He is a friend of Tom's father是否正确 ___ is Tom?He's next to David. Tom’s computer is broken.He’ll have it _______. .look at tom's c__ how busy he is he is Tom and Mike's father.改为复数句子 把he often helps Tom when he is in trouble改为被动语态 Tom is shy .He gets ( ) when he speaks in front of people Tom's mother said that he was out when I visited him同义句Tom's mother said that he wasn't ____ ____ when I visited him He is a friend of_____ A Tom's father's B Tom's father C Father'sof tom D Tom father's