改错he can't is a doctor .he must be a student

1he can't is a doctor .he must be a student 2the girl spent an hour make the paper plane 3she is the teacher which teaches us chinese 4the man lives next door

1He can't be a doctor .he must be a student. ( is -> be，情态动词CAN后的动词要用原形)
2The girl spent an hour making the paper plane. ( make- > making 因为 "spend .. doing sth 是固定用法)
3She is the teacher who teaches us chinese.( which -> who，先行词是人‘TEACHER’，引导词用WHO作主语）)
4The man lives in next door.( lives-> lives in 因为LIVE 是不及物动词）

must 和can't 是情态动词，没有人称和数的变化，不管主语是i 还是he，都不需要变。 is 不能和 i 连用。 而且本句中see 是动词原形，不能用isn't 。 补充： like 是实意动词，否定句必须借助于助动词do 或does 等，主语是i ，用don't ，主语是 he，用第三人称单数的助动词doesn't。 【俊狼猎英】团队为您解答。

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