Question

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

Answer 1

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