Do natives say something like:
We usually use indefinite article when ...
The phrase "usually use" seems a little funny to me)
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'Usually use' repeats the 'use' sound, but that isn't really a problem, it's quite normal. Examples:
Basically, anytime you can use ‘only’, you can usually use ‘just’ to mean the same thing. (BBC English web site)
We can use when to introduce a single completed event that takes place in the middle of a longer activity or event. In these cases, we usually use a continuous verb in the main clause to describe the background event (Cambridge Dictionary)
As has been commented, you can use 'generally', 'normally', 'typically', etc.