條繩就快斷既英文點講?

Simply say:

The rope is breaking.

Normally, verb form like cotinuous tense also contains the meaning of future tense in particular case. That case is that when we are sure sth is going to happen very soon, like the case you have mentioned.

條繩就快斷既英文點講?
The rope seemed breaking very soon.

The rope is breaking.

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The rope is giving way.

The rope is snapping.

The rope is going to break係

The rope is going broke
The rope is going broke
The rope is going broke

The rope is going broke
I am no sure, but hope I can help you.

The rope is going to break.