5предложений типа conditional ( if + present simple, present simple / if + past simple, past simple)

1. He could do it if he tried.
2. You might find him there if you called at seven o’clock.
3. If you see him, ask him to ring me up.
4 if she comes, show her the letter.
5 if he called on them yesterday, they gave him your letter.
 6 if she is here she is probably at the class.