1 Look at the examples. Which tenses are used in each pair? Match each example to rule a or b.

1. Example 1 uses present simple ('discover', 'take') and matches rule a (zero conditional).
2. Example 2 uses present simple ('are', 'transfer') and matches rule a (zero conditional).
3. Example 3 uses present simple ('protect') and 'will have' (future simple), matching rule b (first conditional).
4. Example 4 uses 'won't have' (future simple) and present simple ('do'), matching rule b (first conditional).
Final Answer: 1-a, 2-a, 3-b, 4-b