If I (know, knew, had known) you were in hospital, I
would have visited you.
We (will call, would call, would have called) you, if we
are home on time.
She would have caught the train if she (were, is, had
been) in a hurry.
If you (speak, spoke, had spoken) more slowly, he would
understand you.
I (will tell, would tell, would have told) you more if you
were my friend.