305) If I were you, I wouldn't drink so much whisky
306) I haven't gone there since I was a child
307) If you don't hurry, you will late for the train
308) John asked me whether I had gone out with my brother the night before
309) She hasn't written to me since 3 months
310) Speaking English fluently is very useful
311) Unless you pay me 10$ extra, I won't complete the work
312) Plans have been drawn for an extension to the house by the architect
313) If we had had enough money, we would have gone on holiday
314) If he doesn't phone immediately, he won't get any information
315) Unless somebody the child for a doctor, he will die