if引导的从句可以用过去时吗？
可以。if分真实条件句和非真实条件句（虚拟语气），如果主句将来时从句一般现dao在时，那就是真实条件句，如果从句一般过去时，主句需用would＋动词原形，这就是虚拟语气，表示所表达内容与现在事实相反，比如IfIwereyou，Iwouldn＇thelphim．说明我不是你。
在初中阶段常由if（如果）引导条件状语从句表示主句动作发生的条件，表示假如有从句的动作发生就会有主句的动作发生。例如：
Pleasecallmeifheisathome．假如他在家的话，请给我打电话。
扩展资料：
if后面可以跟很多种时态：
1、当条件句表可能，主句多用将来时；例如：Thevolleyballmatchwillbeputoffifitrains．如果下雨，排球赛将会推迟。
2、条件句表事实，主句常用现在时。例如：Ifyouheaticeitturnstowater．如果对冰进行加热，它会化成水。
3、if从句用一般现在时，主句用must／should例如：Ifyouwanttoloseweightyoumust／shouldeatlessbread．如果你想减肥，你必须少吃面包。
4、if从句用一般现在时，主句用may/might/can 例如： If the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落。
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