Помогите пожалуйста)!
раскройте скобки, образуя предаточные условия первого типа.
1) lf you (to be) busy, l (to leave) you alone.
2) lf i (to get) a ticket, i (to go) to the Philharmonic.
3) lf my father (to return) early, we (to watch tv together.
4) lf she ( to know) english, she (to try) to enter the university.
5) lf my friend (to come) to see me i ( to be) very glad.
6) lf we (to receive) a telegramme from him, we (not to worry).
7) lf you (not to work systematically you (to fail) at the examination.
8) lf it (to snow), the children ( to play) snowballs.