1. If they (cook) pancakes. I (help) them.
2.He (phone) her parents if he (be) late."
3. If she (go) to the museum, she (make) some photos there.
4. Veronika (not/dance) if she (be) tired."
5. If the weather (be) warm. I (swim) in the lake.

Ответ:

1. If they cook pancakes I'll (will or shall) help them.

2. He will phone her parents if he is late.

3. If she goes to the museum she will make some photos there.

4. Veronica won't (will not) dance if she is tired.

5. If the weather is warm I shall swim in the lake.

Объяснение:

После "If" глагол в Present Simple