Where it appears in the exam
What is it?
Three structures with the word 'used' that mean completely different things. 'Used to' + infinitive = past habit or state that no longer exists. 'Be used to' + -ing = be accustomed to something. 'Get used to' + -ing = be in the process of becoming accustomed. On top of this, 'would' serves as an alternative to 'used to' — but ONLY for repeated actions, never for states.
Why it matters in the exam
Cambridge exploits this trio in Part 2 (produce the correct word with no options) and Part 4 (transform between the forms). The real difficulty isn't knowing what each form means — it's not mixing them up when they appear together in the same text. Most learners' past tense instinct treats habitual actions and past states identically, so the distinction feels unnatural.
The cognitive trap
"Your brain treats 'used to play' and 'used to live' as the same pattern — and extends it to 'would'"
This is overgeneralization: once you learn that 'would' can replace 'used to', your brain applies the substitution universally. But English draws a hard line between ACTIONS (repeatable, dynamic) and STATES (continuous, static). 'Would' only replaces actions. Your brain doesn't make this distinction because past habits and past states feel equally 'finished'.
"I used to play" = "I would play" ≠ "I used to live" ≠ "I would live" ✗
In English, 'would' only works for repeated actions. For states (live, know, have, believe), only 'used to'. Your brain doesn't naturally separate these categories.
Recognition pattern
In the exam, look for the key signal first. The answer follows.
The 'used to' trio — 3 forms, 3 meanings, 3 structures
Past habit (no longer happens)
Repeated actions in the past
"I used to smoke, but I quit five years ago."
Past state (no longer true)
Permanent past situations
"She used to live in Berlin before moving to Madrid."
Be accustomed to (present)
Current familiarity with something
"I'm used to working late — it doesn't bother me."
Was accustomed to (past)
Past familiarity
"She was used to living alone after years by herself."
Become accustomed (ongoing process)
Adaptation in progress
"I'm getting used to the new schedule."
Manage to become accustomed (completed process)
Future or achieved adaptation
"You'll get used to it eventually."
Signals that determine the form
"When I was young, I used to / would ride my bike to school."
"I used to know her well." (NOT would know)
"She is used to getting up early."
"He's getting used to the cold weather."
"I didn't use to like vegetables."
"I used to eat meat, but now I'm vegetarian."
"I'm used to the noise — it doesn't bother me."
"I'm gradually getting used to the new system."
The errors that Cambridge exploits
"I'm used to work long hours."
Mixing forms: 'used to + infinitive' (past habit) with 'be used to' (accustomed). After 'be used to', ALWAYS -ing.
"I'm used to working long hours."
Be used to + -ing = be accustomed. 'To' is a preposition, it demands -ing.
"She would live in London."
'Would' ONLY works for repeated actions. 'Live' is a state — would is impossible here.
"She used to live in London."
Used to + infinitive for a past state that is no longer true.
"He can't get used to drive on the left."
Same error: confusing 'to' (preposition + -ing) with 'to' (infinitive). Test: if you can substitute a noun after 'to' ('used to THE TRAFFIC'), it's a preposition → demands -ing.
"He can't get used to driving on the left."
Get used to + -ing = process of adaptation. 'To' is a preposition, not an infinitive marker.
"Did you used to play the piano?"
Double past marking: 'did' + 'used'. Cambridge accepts 'use to' (without -d) in interrogative and negative forms.
"Did you use to play the piano?"
With 'did', the verb loses the -d: 'use to', not 'used to'.
Why your brain gets it wrong
The learner's short circuit
Analyse the trap by exam format
My grandfather ______ to have a small workshop in the garden where he spent hours making furniture.
Your brain knows we're talking about the habitual past and produces 'would' — it sounds right with 'spent hours making'. But 'have' is a STATE verb (possession). Would + state = impossible.
to have
'to have' (possession) = state, not repeated action. Only 'used to' works with past states.
→ used
State verbs disguised as actions
Cambridge chooses state verbs that sound like actions in context: 'have a workshop' seems like an activity, but it's possession. 'Would' + state = always incorrect.
Strategy
Before writing: does the verb describe a STATE (have, know, live, be, believe, own) or a REPEATED ACTION? If it's a state → only 'used'. If it's an action → 'used' or 'would'.
Having worked in London for ten years, she was quite ______ to commuting long distances every day.
Your brain looks for an adjective meaning 'accustomed' and produces 'accustomed' — correct in meaning, but the gap asks for the construction 'be used to'. In Open Cloze, Cambridge prioritises fixed grammatical structures.
to commuting
'was quite ___ to commuting' = be used to + -ing. The structure demands 'used', not a synonym.
→ used
Part 2 asks for structure, not synonyms
Open Cloze doesn't reward vocabulary — it rewards grammar. 'Accustomed' is correct in another format, but here Cambridge expects the fixed structure 'be used to + -ing'.
Strategy
Read the words AROUND the gap. 'Was ___ to + -ing' = 'used'. 'Was ___ to + infinitive' = different pattern. The structure decides.
At first, Sarah found it hard to work night shifts. Sarah found it hard to ______ night shifts at first. (USED)
You build 'get used to' correctly — but then put the infinitive ('work') instead of -ing ('working'). Your brain interprets 'to' as an infinitive marker. Here 'to' is a PREPOSITION.
USED
'Get used to' = preposition TO → demands -ing. If you can substitute a noun ('the night shifts'), it's a preposition.
→ get used to working
'To' as preposition vs 'to' as infinitive marker
The most subtle error in the trio: in 'used to smoke', 'to' marks the infinitive. In 'be/get used to smoking', 'to' is a preposition. Same word, different function.
Strategy
Substitution test: if you can put a noun after 'to' ('used to THE NOISE'), it's a preposition → demands -ing. If not ('used to PLAY'), it's an infinitive marker.
Used to / Would for Past Habits is 1 of 82
The exam tests 82 grammar competencies across 19 families. Mastering one is the first step. Automating all 82 is passing.
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