The verb to cost · Conjugation
Past Perfect of cost
The answer: had cost
B2
A past action that happened before another past action.
Quick answer
The Past Perfect of the verb to cost is had cost.
Example: She had already cost a lot of money when I arrived.
Full conjugation in the Past Perfect
| Pronoun | Form | Contraction |
|---|---|---|
| I | had cost | I'd cost |
| You | had cost | You'd cost |
| He / She / It | had cost | He'd / She'd / It'd cost |
| We | had cost | We'd cost |
| You (pl.) | had cost | You'd cost |
| They | had cost | They'd cost |
Common mistakes to avoid
1. After had, always the past participle
With cost, the Past Simple and the past participle are the same (cost), so I had cost is easy. But many irregular verbs have two different forms: I had gone, not I had went; I had seen, not I had saw.
2. Yesterday I had gone to the cinema ❌
Use the Past Perfect only for the earlier of two past actions. For one past action, the Past Simple is enough: Yesterday I went to the cinema. With cost: cost for one action, had cost for the action that came first.
3. 'd = had or would?
'd can mean had or would. Usually, the next word tells you: I'd seen = I had seen, I'd see = I would see. With cost, the two look the same. So look at the rest of the sentence: already or before suggests had; if suggests would.
Practice quiz
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Frequently asked questions
How do you conjugate cost in the Past Perfect?+
Use had + the past participle cost. The form is the same for every person: I had cost, she had cost, they had cost. The short form is 'd: I'd cost.
When do you use the Past Perfect of cost?+
Use it for an action that happened before another action in the past. It shows which action came first: When we arrived, the film had already started. The film started first, and then we arrived. Signal words: before, after, already, by the time.
What is the past participle of cost?+
The past participle of cost is cost. You use it after have, has and had. It is the same as the Past Simple: cost.
What is the difference between had cost and have cost?+
Have cost (Present Perfect) connects the past to now. Had cost (Past Perfect) connects an earlier past to a later past. Compare: I have finished my homework (so I can play now) and I had finished my homework before dinner.
How do you make the negative and the question of cost in the Past Perfect?+
Negative: I hadn't cost (had not). Question: put had before the subject: Had you cost…? The past participle does not change.
Related pages: cost Past Perfect
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Updated on 12 November 2026 by the Big Challenge teaching team. Every year, more than 500,000 students across Europe take part in our English contest, created in 1999. Our teaching approach →
The Big Challenge · Updated on 12 November 2026 · Source: www.thebigchallenge.com/bl/academy/learn-english/verbs/cost/past-perfect
© The Big Challenge. Copying allowed for classroom use. Every year, more than 500,000 students across Europe take part in our English contest, created in 1999.
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More forms of the verb to cost are coming soon.