I’m sorry but we need background info
simple past: She washed her car.
positive: I am a teacher. She is a student.
negative: I am not a teacher. She is not a student.
interrogative: Would you like coffee? Can you go outside?
Answer:
A number of people <u>are</u> concerned about the lack of progress.
Explanation:
Verbs in the English language agree with the subject of the sentence in number. “A number of people” is the subject, since they are the ones performing the action (expressing concern). Since “people” is plural, the correct form of the verb “to be” is “are”.
Expository, which means that everything being said is based off of true facts. A newspaper gives you live coverage of what is happening around the world. Essays are nonfictional because you mostly write them based off of a document you have read. And biographies are made by THAT person it's written over.