连词与状语从句引导宾语从句时态需根据具体情况而定是否He asked whether/if we wanted a drink.He didnt know whether/if we should write or phone.主将从现When Summer comes,We will go to the beach.延续性动词非延续性动词whenwhen只能用延续性动词whilewhile1.掌握条件状语从句和时间状语从句的引导词及各自的用法掌握条件状语从句和时间状语从句的引导词及各自的用法I.条件状语从句条件状语从句从属连词：从属连词：if 假如假如;如果如果;倘若倘若;要是要是 unless如果不如果不就就；除非；除非否则否则 =if notII.时间状语从句时间状语从句从属连词从属连词:when 当当的时候的时候 as soon as 一一就就
