Hubiera/habria

"Yo no lo hubiera podido hacer sin ti."

(I would not have been able to do it withou you - if I understood it right)

But, if-clauses type III says: If I had... I would have - Si you hubiera... you habria...

Then, wasn't this sentence suppose to be:

"Yo no lo habria podido hacer sin ti"? (would it be a mistake to say it like this?) Or maybe, this sentence, in this form, means "I was not able to do it without you"?

You see, I DESPERATELY NEED THE SEQUENCE OF TENSES

Thanks

Thank you for trying, but I still have to insist (if you have the pacience to read and answer):

I would not have been able to do it without you (inglés)

=No lo hubiese/hubiera podido hacer sin ti (español),

BUT, in "If clauses" the construction is:

If I had known I would have told her.

Si lo hubiera sabido no se lo habria dicho.

 So, it seems that "would have" can be said in 2 ways (hubiera/habria). HOW AM I SUPPOSE TO KNOW WHEN TO USE WHICH ONE? That is what confuses me!

Ok, I know that in IF-Clauses "would have" I will always say with "habria", but when I don not have an If-Clause, then for expressing "would have" I should always use "hubiera"? Is that the point?

And PLEASE, could you translate these sentences for me:

I think he goes to work./went to work/has gone to work/had gone to work/will go to work/might go to work.

I thought he goes to work/went to work/has gone to work/had gone to work/will go to work/might go to work.

Thank you