(My current roommate is in New York doing a post-doctoral study. English is not her first language, so she sometimes asks me to proofread cover letters or research grant proposals as a native-speaker.)
K: Okay, I just finished this one.
R: Thanks! How was it?
K: Nothing major, really I only had one or two comments on tenses and a couple of random words here and there.
R: Words? Like how?
K: Well….okay, you know how you talk about how something “peeks” at some point? ….You actually used the wrong one; it should have been “peaks”.
R: (gasps) Oh, God, where did I do that?….(scans file) ….Oh, there. Oh, God. Yeah, you’re right.
K: Don’t worry about it! That’s actually pretty common….
R: Yeah, but still.
K: (shrugging) Hey, English is weird, yo.