Conditionals type 2 or second conditionals are used to describe hypothetical, unlikely, or impossible situations. These sentences are not based on facts, thus we can refer to any time.

If Peter cleaned his place, he would let us come in.

Use the past simple tense in the

if clause and would + V in the main clause. Note that the order of the main and if clauses is not fixed. Although when the if clause precedes the main one, use a comma.