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cost

Irregular verb — eleven tense patterns across all persons

Irregular forms

base: costpast: costpast participle: cost

Third person singular adds -s or -es.

I	you	he/she/it	we	they
I cost	you cost	he/she/it costs	we cost	they cost

am / is / are + -ing.

I	you	he/she/it	we	they
I am costing	you are costing	he/she/it is costing	we are costing	they are costing

have / has + past participle.

I	you	he/she/it	we	they
I have cost	you have cost	he/she/it has cost	we have cost	they have cost

have / has been + -ing.

I	you	he/she/it	we	they
I have been costing	you have been costing	he/she/it has been costing	we have been costing	they have been costing

One form for every person.

I	you	he/she/it	we	they
I cost	you cost	he/she/it cost	we cost	they cost

was / were + -ing.

I	you	he/she/it	we	they
I was costing	you were costing	he/she/it was costing	we were costing	they were costing

had + past participle.

I	you	he/she/it	we	they
I had cost	you had cost	he/she/it had cost	we had cost	they had cost

will + base form, the same for every person.

I	you	he/she/it	we	they
I will cost	you will cost	he/she/it will cost	we will cost	they will cost

will have + past participle.

I	you	he/she/it	we	they
I will have cost	you will have cost	he/she/it will have cost	we will have cost	they will have cost

would + base form.

I	you	he/she/it	we	they
I would cost	you would cost	he/she/it would cost	we would cost	they would cost

Required after insist, demand, suggest and in formal that-clauses.

I	you	he/she/it	we	they
I cost	you cost	he/she/it cost	we cost	they cost