The sentence 'I went to the store.' is in the past tense, which is correct because the action of going to the store has already happened.

The sentence 'The cat sat on the mat.' is punctuated correctly because there is a period at the end of the sentence and a comma after the word 'cat'.

The sentence 'The cat sat on the mat.' has the correct sentence structure because the subject (the cat) comes before the verb (sat) and the object (the mat) comes after the verb.

The sentence 'I went to the store yesterday.' uses the correct verb tense because the action of going to the store happened in the past.

The sentence 'I gave the book to him.' uses the correct pronoun because 'him' is the object pronoun for the masculine singular pronoun 'he'.

The sentence 'The red car is fast.' uses the correct adjective because 'red' is an adjective that describes the color of the car and 'fast' is an adjective that describes the speed of the car.

The sentence 'The car quickly drove down the road.' uses the correct adverb because 'quickly' is an adverb that describes how the car drove.

The sentence 'The cat sat on the mat.' uses the correct preposition because 'on' is a preposition that indicates that the cat is resting on top of the mat.

The sentence 'The cat and the dog are friends.' uses the correct conjunction because 'and' is a conjunction that connects two nouns or noun phrases.

The sentence 'Ouch! I stubbed my toe.' uses the correct interjection because 'Ouch!' is an interjection that expresses pain.

The sentence 'The dog chased the cat.' is written in the active voice because the subject (the dog) is performing the action (chasing).

The sentence 'The cat was chased by the dog.' is written in the passive voice because the subject (the cat) is receiving the action (being chased).

The sentence 'The cat.' is a fragment because it is missing a verb.

The sentence 'The cat sat on the mat and the dog chased the ball.' is a run-on sentence because it has two independent clauses that are not joined by a comma or a conjunction.

The sentence 'The cat sat on the mat. The dog chased the ball. The bird flew away.' is a paragraph because it is a group of sentences that are related to each other and that develop a single idea.