Modal verbs

Used + infinitive

We use used + infinitive to talk about finished past states or habits.

• I used to live here when I was a child. (state)
• They used to fight a lot, but now they don't. (habit)

+	I/you/we/they/she/he/it	used	to smoke.(?)
-	I/you/we/they/she/he/it	didn't use
?	Did I/you/we/they/she/he/it	use