if引导的条件状语从句

用 法 ① 主句为一般将来时态，if从句用一般 现在时态（即主将从现）。 ② 主句中含有情态动词，if从句用一般现在时态。 例 句 We will stay at home if it rains tomorrow. 如果明天下雨，我将要呆在家。 If you finish your homework, you can go home now.如果你做完了作业，你现在可以回家了。 ③ 主句为祈使句，if从句用一般现在时态。 Don’t jump into the river if you feel very hot. 如果你感到很热，不要跳入河里。 ④ 主句为过去将来时，if从句用一般过去时If I were you, I wouldn’t do it like that. 态（如果涉及到be动词，一律都用were）。如果我是你，我就不会那么做的。 此时，表达的是和现实相反的推测，用虚If you gave me some money, I would be very happy. 如拟语气。 果你给我一些钱，我就会很高兴的。 【边学边做】用括号内所给词的正确形式填空。 1. What will you buy if you ________（have）a lot of money 2. If it ________（not snow）tomorrow, we will feel unhappy. 3. You mustn’t go to school if you ________（be）still in bed. 4. If he _______（be）at home at that time, he would know it. 5. Please show me the way if you ________（know）it. 6. You will hurt your teeth if you ________（eat）too much candy. 7. If you gave me a toy car, I _________（be）very happy. 8. I would get the prize if I _________（work）hard.