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1、-if引导的条件状语从句08858-第 2 页if引导的条件状语从句用法例句主句为一般将来时态，if从句用一般现在时态（即主将从现）。We will stay at home if it rains tomorrow.如果明天下雨，我将要呆在家。主句中含有情态动词，if从句用一般现在时态。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。主句为祈使句，if从句用一般现在时态。Dont jump into the river if you feel very hot.如果你感到很热，不要跳入河里。主句为过去将来时
2、，if从句用一般过去时态（如果涉及到be动词，一律都用were）。此时，表达的是和现实相反的推测，用虚拟语气。If I were you, I wouldnt do it like that.如果我是你，我就不会那么做的。If you gave me some money, I would be very happy.如果你给我一些钱，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 mustnt 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.