Choose the correct options to complete the rules.
RULES 1. We use the first conditional to talk about a possible event and its result in the future / past. 2. We introduce the situation with if or unless + present / past simple. 3. We describe the result with will and won’t / do and doesn’t + infinitive without to. 4. We use unless to say if... not / if ... when. 5. When the if clause is first / second, we use a comma. When the if clause comes first / second, we don't need a comma. If the Earth gets too crowded, we'll move to other planets. We'll move to other planets if the Earth gets too crowded. |
1. future
2. present
3. will and won't
4. if...not
5. first/ Second
