1. I (would have visited) Sarah yesterday if I (had known) that she was ill.
2. If you (had gone) with me to Paris last month, you (would have seen) the Eifel
Tower too.
3. We (would not have got wet) if you (had taken) an umbrella.
4. If Mum (had not opened) the windows, our room (would not have been) full of
mosquitoes.