1、5.have tohave（has）to与must一样，表示“必须”的意思，两者的区别参见第154页比较：must 与 have to。1) have to的用法I have to get up early tomorrow morning.我明天早晨必须（不得不）早起。1.have（has）to +动词原形have（has）to后面要用动词原形。当主语为第三人称单数时用has to，当句子是过去时用had to。We have to leave now.我们不得不现在就离开。He has to work on Sunday.他不得不在周日工作。I had to do my homework
2、last Sunday.上周日，我不得不做作业。2) have to的否定句句型：主语+dont（doesnt）have to+动词原形.You dont have to walk so fast.你不必走那么快。He will not have to buy a new coat next year.明年，他没必要买新外衣了。3) have to的疑问句句型：Do（Does）+主语+have to +动词原形？Do you have to study maths now？你现在必须学数字吗？Yes，I do.是的，必须学。No，I dont（have to）.不，不必学。Did he hav
3、e to ask the question？他非要问那个问题吗？Yes，he did.是的。No，he didnt（have to）.不。have to 练习题词形转换1You must wash the dishes. =You_ _ wash the dishes.2She can cook well. =She _ _ _ cook well.3Wash your face at once. =You _wash your face at once.4They couldnt find any secrets（秘密）.=They _ not _ to find any secrets.5 You should be here on time. =You _ _ be here on time.【答案】1have to2is able to3must4was, able5ought to
