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I don’t care (about) what other people say.

I was surprised (at) how well he spoke English.

Is it more common to omit propositions than to keep them in the examples above?

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teacherJapan

I don’t care (about) what other people say.

I was surprised (at) how well he spoke English.

Is it more common to omit propositions than to keep them in the examples above?

I usually omit them, especially after "I don't care".

CJ

Comments  
teacherJapanIs it more common to omit propositions than to keep them in the examples above?

Nothing is omitted. Some verbs have that capacity.

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 CalifJim's reply was promoted to an answer.
Thank you very much, CJ and anonymous.