A thread handling grammar?! Somebody pinch me...
I think I've got something to add. Ehrm.
The Apostrophe And You
The apostrophe serves three purposes, I'll go over one of them for the time being.
Namely to describe ownership, e.g. Bob's Car. The car belongs to Bob. It is his car.
But what happens when a name ends with an S?
You STILL add the apostrophe and S, e.g. Agnes's Car.
The one exception to this, is ancient names like Jesus, i.e. Jesus' Car.
Don't ask me why, as far as I know, nobody knows why this is.
However, when we are talking about a group, the S goes away, e.g. The Thieves' Guild (several thieves owns a guild).
As opposed to, The Thief's lockpick, for instance (one thief owns a lockpick).
You do not add the apostrophe to certain possesive pronouns like, our, their, mine.
"Our clothes. Who does the clothes belong to? They are ours." - Here we're talking about a mix of several people's clothes.
I.E. and E.G.
This is a very common mistake, when people use i.e. when they mean e.g.
I.E. and E.G. are latin Words, Id Est (that is) and Exempli Gratia (for the sake of an example).
I.E. Means that you are giving a complete recounting, nothing further can be added.
For example; "I used to read about Donald Duck and his three nephews, i.e. Huey, Dewey and Louie."
Donald Duck only has three nephews, nothing further can nor need be added.
E.G. Means that you are giving an example.
For example; "I like fruit, e.g. oranges and pears."
This implies that the person liking fruit, has other fruits that that person would also enjoy, but is simply giving a short example.