we____ use mobile phone when the plane take off

we____ use mobile phone when the plane take off when the plane take off ,you（ ）use your mobile phone You should turn off your mobile phone when the plane _______ You must turn off your cell phone when you take a plane同意句 You must turn off your cell phone when you take a plane.改为否定 You must turn off your cell phone when you take a plane改为否定句 could you please tell me when the plane -------(take off) has it been announced when the plane is to take off中为什么用when How to use the mobile phone 的英语作文 —When is the plane to Shanghai going to take off? Steven,could you help me__ when the plane will take off on t 一到英语题Steven could you help me~when the plane will take off o