is this what we decided?这里为什么要加what?

is this what we decided?这里为什么要加what? is this what we decided? And this is where we've decided that what we really need is This is what we must What is this in english?为什么要用What is what (sets) them apart is hope.请问这里的sets为什么要加S? What matters is what happened 这里为什么matter后面加s when he will come back is what we want to know为什么is后面要加what, 为什么是What is this 而不是This is what? this is what we learns是什么从句 This is what we have twit today. this is what we call a chain reaction还是this is what is we ca