adverb
1
BAD : This is a serious problem for teachers anywhere.
GOOD : This is a serious problem for teachers everywhere.
BAD : Computers will be anywhere we go.
GOOD : Computers will be everywhere we go.
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When you mean 'in/to all places', use everywhere (NOT anywhere ).
2
BAD : When it snows, it is difficult to go to anywhere.
GOOD : When it snows, it is difficult to go anywhere.
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See note at SOMEWHERE 2 (↑ somewhere )