Question

Have you ever had problems in you life and don't know how to be happy?

and表并列，但had和don't明显不同啊。。这是怎么回事呢？？

Answer 1

have 与don't都是动词
股用and
have problems 和 don't know how to be happy 不是并列
Have you ever had problems与don't know how to be happy才是

Answer 2

你需要理解句子意思 再来做分析 而不是只是看单词

have problems 和 don't know how to be happy 其实是并列的关系，他们所指一样
因此用 and