1)if you(to be) free, i (to come) to see you. 2)if (to see) her. i (to be) glad . 3)if you (to be) busy. i (to leave) you alone. 4)if i (to live) in moscow .i (to visit) the tretyakow gallery every year. 5) if she (to know) english , she (to try) to enter the university. 6) if mother (to buy) a cake ,we (to have) a very nice tea part

1) are free (т.к. после if будущее время не ставится); will (shall) come 
2) see; will be
3) are busy; will leave
4) live ; will visit
5) knows; will try
6) buys; will have

Континиус ставиться не может, т.к. if - если - обозначает еще не точное время в будущем