We're having lunch ：否定句; we are not having lunch 一般疑问句：are you having lunch I'VE already had lunch 否 i haven't had lunch yet 一般 have you already had lunch I had lunch at half past twelve...帮帮我把下边的也做一下，好不......我自己害怕错了I'VE just had a cup, thank you.否 i have not had a cup yet ,thank you 一般 have you had a cup ?We can have our coffee there. 否; we can not have our coffee there 一般：can you have coffee there We're going to leave tomorrow.否; we are not going to .....一般： are you going to ....Tom and I are going to have a holiday.否：Tom and i are not going to ....一般; are you and tom going to ....I've already had my holiday this year.否; i haven't had my holiday this year yet一般：have you had your ``````这样就行了