1) It’s is the contraction. Its is the possessive.

2) The following sentence is correct. I was exhausted so I went to lie down for a nap.

3) The shortest possible sentence includes a subject, a verb and an object.

4) Adverbs only modify verbs and adjectives only modify nouns.

5) To make a word plural, you usually add an apostrophe and an "s".

6) A noun is a person, place or thing.

7)An article is considered a preposition.

8) A conjunction provides transition between sentences or parts of sentences.

9) Oh! and Wow! are examples of interjections.

10)Adverbs almost always end in -ly.

11)The first person singular would be you.

12)The third person plural would be "they."