What is the difference between the prepositions ''to'' and ''at?''

asked 2017-07-28 23:58:12 -0400

Zehra gravatar image

What is the function and the reason to use ''to'' and ''at'' in the following sentences: a. Don't yell at me b.*Don't yell to me.
c. Don't speak to me. d. *Don't speak at me.

Why is a and c true but not b and d false?

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