В Переводчике забей :-)))))
1If you are busy I'll leave you alone.
If you were busy I would leave you alone.
If you had been busy I would have left you alone.
2If my friend comes to see me I will (shall)be very glad.
If my friend came to see me I would be very glad.
If my friend had come to see me I would have been very glad.
3If he sends an e-mail we won't(shan't) worry.
If he sent an e-mail we wouldn't worry.
If he had sent an e-mail we wouldn't have worried.
2 on 3 above 4 next to 5 in 6 in 7 on 8 behind <span>9 in</span>