题目内容：

1.He can speaks English well 2.they must don't do that again.3.you had better to do it at once.
情态动词用得正确吗?如有错误请改正.

优质解答

1.speaks改为speak(can后面接动词原形）
2.must don't改为mustn't
3.去掉to (had better后接动词原形）