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The Simple English Wikipedia has an article on:
cost is one of the 1000 most common headwords.
correct - cost - could

Pronunciation change

Noun change

Singular
cost

Plural
costs

  1. The cost of something is the price that a person pays for it.
    What is the cost of the car?

Verb change

Plain form
cost

Third-person singular
costs

Past tense
cost

Past participle
cost

Present participle
costing

  1. (transitive & intransitive) When you say that a thing costs, you say that one must pay in order to buy it.
    That diamond ring costs a great deal of money.
  2. (transitive & intransitive) One may say that an action costs a certain bad result.
    It cost me my job when I broke the machine.
    To commit a crime will cost you.

Plain form
cost

Third-person singular
costs

Past tense
costed

Past participle
costed

Present participle
costing

  1. (transitive) When you estimate a cost or set a cost, you cost a thing.
    The repair man costed the work to fix the car.