1

Are the above sentences interchangeable?

Do they have the same meaning or there is a little difference between them?

What is the most common way?

3
Are the above sentences interchangeable?

Definitely not.

I would use "This is not always used." when talking about something that is almost always used, but not always.

I would use "This is not used very often." when talking about something that is almost never used, but is used sometimes.

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