［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。
［误］ Do you like to go with us?
［正］ Would you like to go with us?
［析］ Do you like…问的是习惯，如：Do you like swimming? 而would you like是一次性的邀请。
［误］ I am used to get up early in the morning.
［正］ I am used to getting up early in the morning.
［析］ used to 共有三种用法，① 表示过去的习惯，如：I used to live with my parents. ② 表示过去的习惯延续到现在，如：I am used to swimming in the river. ③ 用于被动语态，如： Oil is used to cook?
［误］ To play with the children are very interesting.
［正］ To play with the children is very interesting.
［析］ 不定式作主语时，应视为单数主语，特别是两个不定式用and作连词作主语时，如指的是一件事也应用单数谓语动词。如：To get up early and to go to sleep early is good for your health.
［误］ He asked me do my homework alone.
［正］ He asked me to do my homework alone.
［析］ 某些动词要求不定式作其宾语或宾语补足语，它们是：ask somebody to do something 要求某人做某事。 tell somebody to do something 告诉某人做某事 还有prepare 准备， decide 决定， happen to 碰巧， seem 似乎。
［误］ he told me to drive a car.
［正］ He told me how to drive a car.
［析］ 要学会疑问词加不定式的用法，特别要注意的是what是疑问代词，而how是疑问副词。如：I want to know what to do. (我想知道干什么)。 I want to know how to do it. (我想知道如何去作)。 要注意的是how to do it 中的it是不可少的，因how是疑问副词，不能作及物动词的宾语，而what是疑问代词，可做do的宾语，所以what to do 后不要加it。
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