The Greens are __leave__（离开）for Canada tomorrow morning.为什么用

The Greens are __leave__（离开）for Canada tomorrow morning.为什么用 Jill is leaving for Canada tomorrow morning.中文 They are leaving for Beijing tomorrow.为什么用“are leaving”? The Greens ———— (leave) for the USA tomorrow ,aren't they _Are_____you able to play the piano for us tomorrow?　为什么用Are They are going to（离开）for Shanghai this Sunday morning. the GREENS用are ,什么时候用is和are? 适当形式填空说明为什么1it(be)six thirty in the morning the greens usual The Greens’ family _____(move)to Canada later. The Greens often fly to Tokyo for vacation.（） the Greens(格林一家）是三单吗,后面用is还是are? The Greens谓语动词用is 还是are