问题描述：
问题解答：
They will leave Shanghai.
用将来时表达
1 WILL + 动原
They will leava Shanghai
2 Be going to +动原
They are going to leave Shanghai
3 现在进行时表将来时
They are leaving Shanghai
4 Be about to 动原(指意愿的,不常见)
They are about to leave Shanghai
They must leave Shanghai
They're leaving Shanghai
They are going to leave Shanghai.
They are leaving Shanghai.
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