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?Let me know if he es. ?Don’t wait for me if I am late. ?Put up your hands if you have any questions. What’s the rule? ( 3) 2. If條件狀語(yǔ)從句中,如果主句有 must,can, may等情態(tài)動(dòng)詞,從句用一般現(xiàn)在時(shí)。( 主情從現(xiàn) ) 3. If條件狀語(yǔ)從句中,如果主句是祈使句,從句用一般現(xiàn)在時(shí)。 ?You must stop if the traffic light is red. ?You may go fishing if you are free. ?He can go home if he finishes his homework. What’s the rule? ( 2) if條件狀語(yǔ)從句中,如果主句是祈使句,從句用一般現(xiàn)在時(shí)。( 主祈從現(xiàn) ) 1. If條件狀語(yǔ)從句中,主句用一般將來(lái)時(shí),從句用一般現(xiàn)在時(shí)表示將來(lái)。 If you won’t hurry up, you will miss the early bus. If you don’t hurry up, you wi