六年级英语语法辅导：have to 用法

　　have to加动词原形

　　表示“不得不”、“必须”的概念。它比must更含有“客观条件使得必须如此做”的意思，并有较多的时态。如：

　　Mr. Johnson has to work very hard to earn a living.约翰逊先生为了谋生不得不拼命干活。

　　I had to leave the party early last night. I wasn‘t very well.昨晚我只得早点离开晚会，我不大舒服。

　　We will have to get up very early tomorrow.我们明天必须起得很早。

　　I shall have to go to the clinic today for my bad cough.我咳嗽得厉害，今天必须去诊疗所看看。

　　［注］口语中的I have got to，you have got to等：I have to，you have to. Have I got to？和Do I have to？这两种疑问形式均可用。