is leaving/was leaving

is leaving 表示将来按照计划或安排要发生的动作, 见 present continuous tense $^{4,5}$ 。下面是一些现在进行时表示将来动作的例子:

1. Hello, Mr Zhu. I've come to say goodbye. I'm leaving on Sunday. 你好，朱老师。我来向您告别。我准备星期天走。

2. When are you leaving? 你什么时候走?

was/were leaving 可以用作过去将来时：

I didn't know they were leaving. 我不知道他们要走。

下列动词常用现在进行时表示将来按计划、安排的活动: come, go, arrive, leave, stay, wear。