Complete the sentences with the in correct grammar from.
1.when i (will come /come) home, my parents will meet me
2. she will join us tonight if she (has/will have) free time
3. helen(calls/will call) you when she returns back home from the gym
4. he believes that the earth(is/will be) even more polluted and overpopulated in future
1 come
2 has
3 will call
4 will be