天气冷了，冬天就要来了。

Tiānqì lěng le, dōngtiān jiù yào lái le.

The weather is getting cold; winter is about to come.

我明天就要回国了。

Wǒ míngtiān jiù yào huíguó le.

I am going back to my country tomorrow.

快走吧，我们就要迟到了。

Kuài zǒu ba, wǒmen jiù yào chídào le.

Hurry up, we are about to be late.