1) If it (is/will be ) sunny, the Browns (go/will go) to the seashore. 2) If she (does/will do) everything right, nothing dangerous (happens/will happen). 3) Tom(will phone/phones) you when he (is/will be) free.

Solution:

1. If it is sunny, the Browns will go to the seashore. (In the 'if' clause, we use the present simple for future events. In the main clause, we use the future simple).
2. If she does everything right, nothing dangerous will happen. (In the 'if' clause, we use the present simple for future events. In the main clause, we use the future simple).
3. Tom will phone you when he is free. (In the main clause, we use the future simple. In the clause with 'when', we use the present simple for future events).

Answer: 1. is, will go, 2. does, will happen, 3. will phone, is