This post is hilariously ironic.
All of the above mistakes are clearly simple typos (in all three cases, the extra/wrong letter is adjacent to the correct one on the keyboard), not to mention that someone who doesn't know that there's not supposed to be a space between the end of the sentence and its punctuation shouldn't be criticizing anyone else's grammar. From the day I learned how to write, I never, ever made that mistake. So what's your excuse, "teacher"?
IF indeed you are a teacher, then all the more reason you shouldn't be making such elementary mistakes in your own writing. Two question marks? That extra space? If that's what you teach your students in English, you ought to be let go for incompetence.