1. Choose the correct item. 12 If I move/I'll move to Boston, I will live on Main Street. 11. If we were late for class, our teacher will be/ would be angry. 15. If you call/ you'll call your mother, she'll be very happy. 16 If you had phoned me yesterday, I had told / would have told you the news. 17. If I had known / would know it was your birthday, I would have sent you a card. 18. If the mechanic fixes our car on time, we drive / we'll drive to Center villa. 19. If I studied/ will study harder, I would get better marks. 20If it rains / it'll rain today, we won't go to the park.

Solution:

• 12. If I move to Boston, I will live on Main Street. (This is a Type 1 conditional, describing a real possibility in the future. The 'if' clause uses the present simple tense.)


• 11. If we were late for class, our teacher would be angry. (This is a Type 2 conditional, describing a hypothetical or unlikely situation. The 'if' clause uses the past simple, and the main clause uses 'would' + base verb.)


• 15. If you call your mother, she'll be very happy. (This is a Type 1 conditional. The 'if' clause uses the present simple.)


• 16. If you had phoned me yesterday, I would have told you the news. (This is a Type 3 conditional, referring to an unreal past situation and its unreal past result. The 'if' clause uses the past perfect, and the main clause uses 'would have' + past participle.)


• 17. If I had known it was your birthday, I would have sent you a card. (This is a Type 3 conditional. The 'if' clause uses the past perfect.)


• 18. If the mechanic fixes our car on time, we will drive to Center villa. (This is a Type 1 conditional. The 'if' clause uses the present simple.)


• 19. If I studied harder, I would get better marks. (This is a Type 2 conditional. The 'if' clause uses the past simple.)


• 20. If it rains today, we won't go to the park. (This is a Type 1 conditional. The 'if' clause uses the present simple.)