没有have better的用法。一般是had better。had better是一个英语词组，意思是最好，可将其视为“情态”动词，可用于一切人称，没有任何词形变化。其后接不带to的不定式，表示现在或将来的概念。
You had best get home before midnight.你最好在午夜之前回到家里。
We had best be going.我们最好现在就走。
You had better go to Singapore.你最好去新加坡。
We had better take off our coats.咱们最好把外套脱掉。
