It is raining hard outside. You'd better ______(not go) to watch the movie.

It is raining hard outside. You'd better（not go） to watch the movie. （原型不变）

You'd better=you had better

had better （not）do sth
最好（不）要做某事

not go
had better + 原型

had better (not)do sth乃固定用法，记住即可。