赖世雄教你学英语语法
虚拟语气
2-1:基本句型结构
使用本虚拟语气时，if从句的动词用过去时，主句则用过去时助动词。句型如下：
if+主语十过去时动词，主语+would/could/might/should/ought to+原形动词
例：if i were rich, i would help you.（如果我很有钱，我会帮助你。）
if he lived in my town, i could see him every day.（如果他住在我住的镇上，我就能每天见到他。）