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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條件狀語從句中,如果主句有 must,can, may等情態(tài)動詞,從句用一般現(xiàn)在時。( 主情從現(xiàn) ) 3. If條件狀語從句中,如果主句是祈使句,從句用一般現(xiàn)在時。( 主祈從現(xiàn) ) 1. If條件狀語從句中,主句用一般將來時,從句用一般現(xiàn)在時表示將來。( 主將從現(xiàn) ) Rules Mary (buy) the book, she will use up all her money. I (be) free, I’ll visit my aunt next Sunday. I (study) hard, I’ll win the English petition. it (be) cold tomorrow, I will wear my sweater. am isbuys