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Hi, although I know to keep verb tenses consistent in a piece of writing, that is almost all I know about tenses. Generally, I just naturally write in the correct tense, but I'd like to know the rules to improve my confidence.

I was hoping you could give me a brief overview of the essential rules about verb tenses. If this is too extensive, then perhaps commenting on this sentence below will suffice: (I extracted this sentence from a book as it caught my eye, when reading it.)

There was little he would not do for the right amount of money, provided there was no real risk for him.

'Provided' is a past participle. Would it be permissible for it to be in present participle form? To me, it sounds like it possibly could, but I'm unsure as 'would do' is past tense, and I suppose this means the participle has to be in the past tense.

Also, I'm aware that tense can change in sentences. Is this only possible changing from dependent clause to main clause?

Thanks for any guidance.
Comments  
The word “provided” here is a conjunction, not a past participle. It means on the condition (that) or if. It is not used in the sense of a past participle. The present participle “providing” would not make sense here. You could be talking about the present and change the tense of the (complex-compound) sentence to present, “provided” is still the conjunction & the correct form.
Oh, how silly of me. Yes, it does makes more sense to be a conjunction (provided that there...).

You could be talking about the present and change the tense of the (complex-compound) sentence to present, “provided” is still the conjunction & the correct form.

I don't understand. Do you mean 'change the tense from the past to the Present? Or was there no typo...