This is John's bag.
No apostrophe is to be putted in this sentence.
no matter what you usually have to put a period after an apostrophe because it's the end of a sentence.
It is correct where you put it.
no, as long as he is not saying that in quotes
The sentence should be: Don't write in Guss' diary.
how do you use tacked in a sentence?
the dinosaurs' heads there i think.
I was putting my findings in my bag.
The word "its" does not require an apostrophe when used as a possessive pronoun. Only use "its' " when it is a contraction for "it is" or "it has," and never as a possessive form.
i morosley put chocalate in my bag.
It depends on the sentence. If you say, "I put my groceries in a bag," , that would be a noun. But if you say, "I bag my groceries," , that is a verb.
It's either an apostrophe .. In a sentence you may, most likely you can't in a word. :{)