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精通英语的来if you become rich,you will have a difficult time know

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/23 08:47:32
精通英语的来
if you become rich,you will have a difficult time knowing who your real friends are. 此句子什么意思? 那个know为什么要加ing?
they say they were happier before they became rich and famous,say 后面用了were, 那么那个say不应该是过去式吗?.
have + n.+ V ing,做某事如何如何
say 指现在说的;were 指过去事情