Imperatives
Use the imperative for commands and instructions.
Say please to be polite.
Affirmative (+) Negative (−)
Sit down. / Please sit down. Don’t sit down. / Please don’t sit down.
Also use the imperative to give advice.
Buy those posters. They’re nice. Don’t buy that painting. It’s strange.
Indefinite Articles: a/an
The indefinite articles a/an come before singular nouns.
Use a before words that begin with a consonant sound: a radio, a calculator, a painting.
Use an before words that begin with a vowel sound: an airplane, an English class.
The vowels are a, e, i, o, u.
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