Usage of "gerunds"

 have a question reharding the usage of gerunds. Are the following senteces correct? If not, Can you expalin why?

  • Before finishing the project, you need to finish your homework.

  • Before your finishing the project, you need to finish your homework.

I know for the above I can say:

  • Before you finish the project, you need to finish your homework.

But when I try to use gerunds, the problem arises.

Another example:

  • John there's a good show going on the TV on career making. Watch It before Its ending.

I know I can say:

  • John there's a good show going on the TV on career making. Watch It before It ends.

Can anyone please explain how I should use gerunds In those sentences?

 

Thanks in advance.

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