〜ほうがいい
Should / shouldn't do something (advice)machine translation
FormationVerb た-form + ほうがいいです / ない-form + ほうがいいです
Used to give someone advice: verb た-form + ほうがいいです means "you should do it," while ない-form + ほうがいいです is "you shouldn't do it."
The most confusing part: the "should" advice uses the た-form (寝たほうがいい), but "shouldn't" uses the present ない-form (吸わないほうがいい) — there is no past form on the negative side.
This is fairly direct advice, suited to family, friends, or when you're concerned about the listener's health. Add よ at the end of the sentence to sound more natural.
Examples
早く寝たほうがいいですよ。
You should go to bed early.
薬を飲んだほうがいいです。
You should take your medicine.
たばこは吸わないほうがいいです。
You shouldn't smoke.