Speak WITH/IN wrong grammar.
"Even native speakers sometimes speak WITH/IN wrong grammar."

Please let me know which one's correct between 'in' and 'with?'

Question

Speak WITH/IN wrong grammar.
"Even native speakers sometimes speak WITH/IN wrong grammar."

Please let me know which one's correct between 'in' and 'with?'

Answer

Even native speakers sometimes speak with the wrong grammar.
or
Even native speakers sometimes use the wrong grammar.
or
Even native speakers sometimes use grammar incorrectly.

Answer

I  agree with Kim.

Answer

"with", but "Even native speakers sometimes use incorrect grammar" is a lot more natural.

Answer

"with" is correct.  However it would be more natural to say " even native speakers sometimes USE wrong grammar"