What troubles me most is.………… 这里的trouble为什么要加s.这里并不是单三呀

What a lot of trouble he is causing 这里的 trouble 为什么不是复数 加 S what's most interesting about it is .这里的most前边为啥不加the? what (sets) them apart is hope.请问这里的sets为什么要加S? is this what we decided?这里为什么要加what? What does"Never trouble trouble till trouble troubles you"me the best time to visit china is…… 这里为什么要加to What matters is what happened 这里为什么matter后面加s what languages does she speak?这里的languege为什么要加"s" that's what you are good at这里为什么要加what?类似的还有you are what you 为什么Eating fruit is good for my health这里要加ing,what's on the o 这里eye要加s吗为什么 这里make为什么要加s