when引导的从句用正在进行时,主句用将来时可能吗

问题描述:

when引导的从句用正在进行时,主句用将来时可能吗
when引导的从句有正在进行时,主句用将来时可能吗
请帮我讲讲,举个例子
it is becomeing colder and colder
become在这里是系动词吗?

It should be " It is becoming cooler and cooler." "Becoming" is 系动词.