--shall we go to the swan park for a picnic tomorrow?--if it fine.Awas B .is C.is going to be D.-shall we go to the swan park for a picnic tomorrow?--if it fine。Awas B .is C.is going to be D will be

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--shall we go to the swan park for a picnic tomorrow?--if it fine.Awas B .is C.is going to be D.-shall we go to the swan park for a picnic tomorrow?--if it fine。Awas B .is C.is going to be D will be
--shall we go to the swan park for a picnic tomorrow?--if it fine.Awas B .is C.is going to be D.
-shall we go to the swan park for a picnic tomorrow?--if it fine。Awas B .is C.is going to be D will be

--shall we go to the swan park for a picnic tomorrow?--if it fine.Awas B .is C.is going to be D.-shall we go to the swan park for a picnic tomorrow?--if it fine。Awas B .is C.is going to be D will be
B

B。 is

B,对将来事情的假设
IF 加WAS是表示对现在事情的假设,加IS/ARE表示对将来事情的假设,加HAD DONE表示对过去事情是猜测。后边加I SHOUID/MIGHT/COULD+DO