Ответ:

1. If I live near the sea, I will go swimming every day.

2. My dad will buy a new car if he has enough money.

3. I will not fell tired if go to bed earlier.

4. Mygranddad will feel healthier if he goes for more walks.

5. If our cousins visit us every summer, we will know them much better.

Объяснение:

В части с "If" всегда будет настоящее время, а в другой части будет употребляться будущее время.