Grammar is the structure of language which has led us to think of actions in terms of doers and statements about those doers where in reality 'the doer' is merely a fiction added to the deed. The deed is everything.

I hate people who mix up 'there', 'their" and 'they're'It's worse than not knowing the difference between your left and write
Grammar is a system of pitfalls thoughtfully prepared for the feet for the self-made man, along the path by which he advances to distinction.

Teacher: "What is the future tense of the statement: 'I had killed a thief'?"Student: "You will go to jail."
Teacher asks her student, "If I say, 'I am beautiful,' which tense is that?"The student replied, "It is obviously past."
They should ban semi-colons;no one knows how to use them
Grammar is not difficult to master. All the grammar that any human being ever needs can be learned in a few weeks from a little book as thin as a Ritz-Carlton sandwich.

Grammar is musical in its punctuation marks. Exclamation points are like silent cymbal clashes, question marks like musical upbeats, colons dominant seventh chords.