When do I use "Used to" and when do I use "Would"?

Used to = past habits and states (both). Would = only repeated past actions/habits (never states like be, have, know). When in doubt: use "used to", it always works.

What is the most common mistake with "Used to" and "Would"?

The key error: "would" with state verbs: "She would be my manager" is ambiguous for past habit (correct: "She used to be my manager"). Other errors: "I use to go" = wrong in affirmative (always "used to"); "I would walk to school" without temporal context sounds conditional, add the context: "When I was young, I would walk to school."

How do I remember the difference between "Used to" and "Would"?

State vs action test: is it a state (be, have, know, like)? = "used to" (never "would"). Is it a repeated action? = "used to" or "would" (both work). Golden rule: "used to" works for states and actions; "would" only works for actions and needs explicit temporal context ("When I was young... / Every morning... + would").

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Used tovsWould

'Used to' works for both past habits and states; 'would' works only for repeated actions, never for states.

Side-by-side comparison

Used to

structure

"Would" describes repeated past actions with a nostalgic tone: "Every summer, we would go to the beach". It cannot describe permanent past states or situations.

When I was young, my family used to have dinner together every evening without exception.
She used to be terrified of flying, but she got over it after travelling a lot for work.
Our neighbourhood used to have a lovely old bakery on the corner, but it closed years ago.

Would

structure

"Used to" can describe both repeated actions and permanent past states: "I used to live there" and "I used to play chess". It is more versatile than "would".

Every summer, my grandfather would take us fishing at the lake before sunrise.
Whenever she was nervous, she would tap her fingers on the desk without even noticing.
On rainy Sundays, we would play board games for hours and my mum would make hot chocolate.

Common mistake

•The key error: "would" with state verbs: "She would be my manager" is ambiguous for past habit (correct: "She used to be my manager").
•Other errors: "I use to go" = wrong in affirmative (always "used to"); "I would walk to school" without temporal context sounds conditional, add the context: "When I was young, I would walk to school."

Trick to remember it

•State vs action test: is it a state (be, have, know, like)? = "used to" (never "would").
•Is it a repeated action? = "used to" or "would" (both work).
•Golden rule: "used to" works for states and actions; "would" only works for actions and needs explicit temporal context ("When I was young... / Every morning... + would").

Quick rule

•Used to = past habits and states (both).
•Would = only repeated past actions/habits (never states like be, have, know).
•When in doubt: use "used to", it always works.

Did you know?

USED TO is one of the few cases in English where a structure only exists in the past and has no present equivalent. "I use to go" in the sense of a present habit is ungrammatical in modern English, for the present you need "I usually go," "I tend to go," or "I am in the habit of going." This temporal asymmetry of USED TO, which only looks backward and always implies contrast with the current present, makes it one of the most specifically retrospective structures in the entire English verb system. WOULD for past habit, by contrast, is simply the same modal/conditional WOULD applied in a different temporal context, which is why without a time frame it can sound ambiguous or conditional.