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had better后接原形动词。 had better的否定式为had better not (do sth), 而不是had not better (do sth)。 had better的一般疑问句为“Had + 主语 + better + do sth?”和“Hadn’t + 主语 + better + do sth?”。
had better后加什么词
1.had better后面必须跟动词原形。had better后跟动词原形(即不带to的不定式)，构成had better do sth.句型。这里的had不能用have来替换。
例句：You'd better go to hospital at once.你最好立即去医院看病。
2.主语不论是第几人称，句子不论是什么时态，都要用had better的形式。
例句：Now you(he，we) had better listen to the teacher.你(他，我们)现在最好听老师讲。
3.had better可用于的时态。
had better用于指现在。
例句：Now you had better listen to the radio.你现在最好听收音机。
had better用于指将来。
例句：You had better start tomorrow.你最好明天动身。
英语中 had better 的用法
had better 用来讨论现在或未来的动作，是说话者认为某人在某个特定的情况下应该做某事，后面接不带 to 的不定式，其中的 had 不是 have 的过去式。在非正式场合中，had better 可以缩写为 'd better，我们可将它归类为“情态动词”。
had better造句
1、Youhad better break with your bad habits.(你最好改掉你的坏习惯。)
2、When James realized how severe her illness was, she knew shehad better hurry up and live life.(当詹姆斯意识到她的病情有多严重时，她知道她最好抓紧时间好好生活。)
3、Youhad better get a doctor to pull out your bad tooth.(你最好去看医生把你的坏牙给拔了。)
4、As he could not find it immediately, he said: "I know you are there, so youhad better come out!"(因为他一时找不到，就说：“我知道你在那儿，你最好自己出来！”)
5、"Oh, youhad better go tomorrow morning, doctor," Clara urged.(“哦，你最好明天早上去，医生。”克拉拉催促道。)
6、She thought youhad better get stronger before you had a governess.(她认为最好等你长结实些，再请女家庭教师。)
7、Ihad better take it off and eat it.(我最好把它拿下来吃了。)
8、The quality of independence is so indispensable for us that parentshad better act as a tutor, not a director.(独立的品质对我们来说是如此的不可或缺，父母最好是一个导师，而不是一个指导者。)
9、Youhad better drive slowly and carefully.(你最好开慢点，小心点。)
10、Hehad better go to bed.(他最好去睡觉。)