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［误］ Is this book yours?
Yes, It's.
［正］ Is this book yours?
Yes, It is.
［析］ 在肯定的回答中不要用缩写形式，而在否定的回答中可以用缩写形式，如：No. It isn't.
［误］ I'll have my bike repair tomorrow.
［正］ I'll have my bike repaired tomorrow.
［析］ have+人+动词原形或现在分词意为：让某人作某事，如：My father had me to learn how to drive， 或My father had me doing my homework from morning till might have+物+动词的过去分词为某件事被别人完成。如：I have my hair cut.我去理发。而不是自己理发。如果讲我想自己作某事，则用I want to repair my bike myself.
［误］ I'll get my brother repair the bike for you.
［正］ I'll get my brother to repair the bike for you.
［析］ have与get的用法有相同之处，也有不同之处。相同之处，如：have something done, 也可用get something done, 或have (get) somebody doing something但不同之处在于have somebody do something 在用get时则要用get somebody to do something。
［误］ I have to study on Saturday but I haven't to study a full day
［正］ I have to study on Saturday， but I don't have to study a full day.
［析］ have to 不得不，而don't have to 为其否定式。
［误］ Is Tom in the classroom? No. He mustn't be in the classroom, because I saw him talking with our teacher in the office just now.
［正］ Is Tom in the classroom? No. He can't be in the classroom because I saw him talking with our teacher in the office just now.
［析］ must 加动词原形表达一种比较肯定的推测，而表示否定的推测则要用can't。
［误］ My grandpa is over eighty but he is able to read without glasses.
［正］ My grandpa is over eighty， but he can read without glasses.
［析］ can (could) 多用于表达客观的事实，主观能力，而be able to 则多用于表达主观的意愿。
［误］ She doesn't answer the doorbell. She should be asleep.
［正］ She doesn't answer the doorbell. She must be asleep
［析］ should 用于现在时态的句子中应译为"应该"，如：You should do your homework right away. 而 must加动词原形表示一种推测。
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