How to use "to be sure ..."
I am not sure about (or: of?) how reliable this test is.
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I am not sure about (or: of?) how reliable this test is.
Here are examples of how to follow "sure" with "about" or "of."
I am not sure about that.
I am not sure of my feelings.
Hope that helps :)
1
I am not sure about (or: of?) how reliable this test is.
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