Let us ensure we insure our cars.
I sent a message requesting a massage.
We made a collage in my college art class.
Just a few of my pet peeves. I won't even go into their there and they're, or your and you're, To and too, oh, there are too many to list. The bigger problem is many of these are found in 'edited' stories. Spell checking isn't all you need to do when you edit. (Not trying to disparage the editors, as I know some authors decide they know better and disregard the edits. Though, if that is the case, I would have my name removed from the list of editors.)