when and where have meeting___yet.havenot decidedhasnot decidedisnot decided为什么用IS呢?是被动么?yet 一般要用什么时态?

when and where还是where and when When and where shall we have our picnic? 选哪个 when and where to go for holiday have not been decided yet.这句是用have还是has When and where的意思 when and where to go for my holiday__not been decided yet.填have?has?为什么? I have bougut a new car.when and where()you ()it?用过去时还是现在完成时 when and where has not been decided为什么是用has 而不是 have When and where did the Pilgrims have their first Thankgibing Day?如何回答? Could you tell me where and when we shall have the food festival.为什么where放在前面 who and who?when and where? Throughout the history of science there have been periods when revolutionary thinkers questioned traditional assumptions and outdated theories.为什么要句子中的when不可以替换成where where和when 都各自适用在什么地方但是where when where who what why and WHERE AND WHEN SHAII WE MEET? when and where was yaoming born? When and where are you forever when and where was lu xun___(bear) as u wish where and when WHEN AND WHERE TO BUILD THE FACTORY____YET?( )A.IS NOT DECIDEDB.ARE NOT DECIDEDC.HAS NOT DECIDEDD.HAVE NOT DECIDED