If从句用一般现在时,主句可以用什么时态?第一种：If he runs he'll get there in time.第二种：If the fog gets thicker the plane may/might be diverted.第三种：If you want to lose weight you must/should eat less bread.第四种：If you heat ice it turns to water.
问题描述：
If从句用一般现在时,主句可以用什么时态?
第一种：If he runs he'll get there in time.
第二种：If the fog gets thicker the plane may/might be diverted.
第三种：If you want to lose weight you must/should eat less bread.
第四种：If you heat ice it turns to water.
答