what we should do is 后面接什么 附加例句啊

what we should do is 后面接什么 附加例句啊 what we should do is 后面加todo 或do.为什么不能加doing what we should do is后面到底加ing还是to do? what should we do? we do should what what should we do when there is a fire? The problem is what we should do with this machine what we should do is to persistence这句话对吗 what we should do is that protect ourselves. What should we do when there is a fire What should we do before meals?What should we do what should we do today