If the weather is fine tomorrow, we will go to the country.
I’ll give you the book on condition you return it next week.
He won’t finish his work in time unless he works hard.
If he should come, I will ask him to wait.
If need should arise, we will communicate with you again.
If you see him, ask him to ring me up.
If she should come, show her the letter.
If he is here, he is probably working in the library.
If he called on them yesterday, they gave him your letter.
If you finish on time, you will go to the movies.
