if条件状语从句基本向后错一个时态比如呢对现在假设，从句一般过去时，住句情态动词加动词原型对过去假设，从句过去完成时，住句情态动词加现在完成时对将来假设，从句三中情况，住句情态动词加动词原型能举例呢三中情况是，一一般过去式，二，were to do三，should加动词原型if i had enoughmoneyi would buy the carif i had had enoughtimei wouldhave done the homeworkifit rained themeeting would be cancele满意吗cancel那个canceled对没拼好