cost means “to cost” in English. It is irregular: some of its forms don't follow the default pattern.
Updated
The forms of cost
The core forms of cost are: third person costs, present participle costing, past simple cost, past participle cost. Because it is irregular, at least one of these is not what the regular rule would predict.
cost in a sentence
In a sentence, cost looks like this: This phone costs too much.. The example shows the context the form turns up in.
Forms and CEFR levels
This page lists 4 forms of cost, grouped by CEFR level. The third person (A1) is free to practise in Verboteca; Premium opens the remaining forms.
FAQ
What does “cost” mean in English?
cost means “to cost”.
Is cost regular or irregular?
cost is an irregular English verb: some of its forms don't follow the regular pattern.
