EXERCISE I: [câu điều kiện] Chia dạng đúng của động từ trong ngoặc: 1/ If I (have) ________ a typewriter, I could type it myself. 2/ If I had known that you were in hospital, I (visit) ________ you. 3/ You could make much progress if you (attend) ________ class regularly. 4/ If I (know) ________ his telephone number, I would give it to you. 5/ If you (arrive) ________ ten minutes earlier, you would have got a seat. 6/ If he (study) ________ harder, he can pass an exam. 7/ She may be late if she (not hurry) ________. 8/ Tell him to ring me if you (see) ________ him. 9/ If you (speak) ________ more slowly, he might have understood you. 10/ What (you do) ________ if you got fat?