Do you know when to have a picnic?为什么用to have?

do know start you to when 连词成句啊 do you know when _______(go)to the concert? Do you know when the train to leave?与Do you know the train when to leave? Do you know when to go与Do you know when go to哪个对?错误原因是什么? Do you know when (meet) Know?I would like you just do not know when you have learned to understand it you certainly do not know ,I think you when he came to tear .you certainly do not know ,I think you when he came to tear 谁知道. 求翻译：why do you care to know when you are not going to have sex? What,when,do,know,you,do,to.fire,there is,a连词成句 you,know,was,when,basketball,invented,do 单句改错：DO you know when they began to fall in love to each other? Do you know when to have a picnic?为什么用to have? when you know how to die ,you know how to Do you know ______ with the meat?A.which to do B.how to do C.when to do D.where to do 怎么选?为什么? When you do fall in love,do you know When did you know this is what your wanted to do?翻译 Do you know when＿?A.leave B.to leave C.leaving D.left when did he move to another city ?do you know?（合并为一句