GUIDE深度 · Deep dive
Question Tags and Conditionals
Question tags flip polarity and match the auxiliary/subject. Conditionals: zero uses present; first if+present/will; second if+past/would; third if+had done/would have done.
Tags
She is happy, isn't she?
They went home, didn't they?
He can swim, can't he?
Conditionals
If it rains, we will stay.
If I were rich, I would travel.
If he had studied, he would have passed.
FAQ
Is were required in second conditionals?
If I were is the standard formal form.
Can I drop had in third conditionals?
No; had + past participle is essential.