You cannot replace 'use' in any of those sentences. Usage : accepted or habitual practice. Usage refers to an accepted standard for a group that regulates individual behavior (from the American Heritage Dictionary).
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ChristanfordCould you help correct this sentence?
I'm confused about the usage of 'usage'. This might be the one example in which "use" and "usage" may be interchanged.
Abraxas25 the usage of a technical term;To my ear (etc.) this phrase is an example in which "use" may clearly be substituted for "usage"; but the meaning changes. (I'm not sure if this has been addressed.)