When you would like to know something, you normally ask a question.
All questions have several common features:
  1. When you ask a question, you raise your voice at the end of the sentence.
  2. When you write a question, you put a ? at the end.
There are two types of questions.
  1. Yes/No Questions:
    When you want to know if something is true or not, you use a yes/no question: Are you tired? Do you want coke? answer: Yes, I am./ No, I'm not. Yes, I do./ No, I don't.
  2. Wh-Questions:
    When you want to know specific information about a fact/person/thing/place/manner/.. then you use a wh-question: Where is the post office? What do you want?

Yes/No questions with to be

When do you use a yes/no question?
You use it when you want to know if something is true or false. For example: Your friend doesn't look happy when you see him. You ask him: Are you okay? because you want him to confirm your feelings.
How do you pose a yes/no question?
Change the word order: put the verb in front of the pronoun/noun: Noun/pronoun + to be + … To be + noun/pronoun + …? You are tired. Are you tired? The boy is sick. Is the boy sick?
You can answer: Yes. / No.. But this sometimes sounds impolite. It is better to answer: Are you a teacher? – Yes, I am. / No, I'm not.
Rewrite the sentences into yes/no questions. Do not change the pronouns.
  1. The flight is great. ⁠?
  2. He is her brother. ⁠?
  3. This is his friend. ⁠?
  4. You are in England. ⁠?
  5. They are excited. ⁠?