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It is used to refer to singular nouns in general, when they are not specific. "A" is used before words that begin with a consonant sound, and "an" before words that begin with a vowel sound.

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"I saw a cat in the garden.

"She is an artist.

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We use this when we express what we are doing but in the past tense.

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Comparative Adjectives:

Used to compare two things.

"My car is faster than yours."

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Superlative Adjectives:

Used to compare three or more things.

"This is the fastest car in the race."

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We use the verb in "-ing" and it functions as a noun in a sentence

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This defines the action of the verb without referring to a person or thing.

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have been or I have been is what defines the action of this

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Have/has" + the past participle of the verb