had better do sth. 最好做某事
这是固定搭配, 适用于各种人称和数.
但是没有将来时,不能用第三人称,也不存在省略不省略to的问题.
更不必纠结于better是副词well还是形容词good的比较级,
只要记住这个用法就行了.
例: You'd better hand in your homework now .
We had better stop talking at once.
They had better finish the work on time .
注: had可与主语缩写也可不缩写.