--- Would you mind if I smoked here?---I am afraid…, but if you________.

The first question was difficult, but the rest were pretty easy.

When I went to their house, there was no light on. They _____ at home.

—Jim，you said you'd lend me your MP5.—I'm sorry I forgot my promise but you ________ have it next Saturday. 

----Shall I go and buy two more bottles of beer? ----No, I’ve already bought them yesterday. That           be enough for us two.