It is distracting to me if there are many errors, and I feel it may bias me to trust the author less. Usually what throws me off the most is the misuse of prepo

It is distracting to me if there are many errors, and I feel it may bias me to trust the author less. Usually what throws me off the most is the misuse of prepositions, where switching 'of' and 'to', for example, in a way that changes the meaning. I remember from learning German that different prepositions are used in different circumstances than they are in English, even though they seem to be the same word. In any case, having a native English speaker edit your article can mitigate this.