Is it correct to say something like this?
I used to use the knife to open things like cans.
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That’s fine (as per Barrie and Manoj), but you may want to say a knife, unless you always did your opening with a specific knife that’s contextually salient.
On the same theme as your question, you can create other sentences where a verb is used both in its “lexical” and its “grammaticized” senses. For instance:
If you get carried away, you could end up with Who has she had to have have you over?