1. Included Questions:
A question included in another question/statement is called Included or Embedded Question.
Examples:
Do you know who they are?  (question included in question)
I don’t know who they are. (question included in the statement)

2. Included Question into Statement:
Included questions into statements are those questions in which we combine one question with one statement. After combining the question changes and becomes affirmative.

The formula for Included Question in Statement:
Phrase + WH Question Word/If + Positive sentence
I am not sure how he got your Email.
I am not sure if he lives here.

Phrases to introduce Included Questions in the Statement:
I don’t know….
I have no idea….
He is not exactly sure….
I really can’t tell you

Examples:
1. I don’t know. (Where does he live?)
I don’t know where he lives.
2. I am not sure. (How much is the price?)
3. I have no idea. (Is he studying the English language?)
4. I wonder. (Were they friends?)
5. I am not exactly sure. (What did he buy?)
6. I don’t remember. (Did he help the poor man?)

3. Included Questions into Questions:
Included questions into questions are those questions in which we combine two questions. When we combine then the second question loses its word order and becomes a positive sentence.
Phrase + WH Question Word/If + Positive sentence +?
Can you tell me where they have gone?
Can you tell me if they live here?
Do you know……?
Do you have any idea…?
Could you please tell me….?
Do you remember….
Examples:
1. Do you know? (Where is his home?)
Do you know where his home is?
2. Can you tell me?  (What is he doing?)
3. Could you tell me?  (Is he a doctor?)
4. Does she know?  (How does an engine start?)
5. Do you have any idea? (What will they buy?)
6. Do you know? (Does she work?)

4. Indirect Questions
Indirect questions are those questions that are asked indirectly. The helping verb and the modal verb come after the subject and it is ended with a full stop instead of a question mark.
Note: In an indirect question: => “A” says “B” to ask “C” or the first person tells to second person to ask the third person.
Note: If the question is from a helping verb or model verb, “if/whether” comes between the two clauses.
Examples:
Do you go to school?
Ask her if she goes to school.
What are they doing?
Ask them what they are doing.
Direct questions

What is she doing?
Will you help us?

Why do they go there?

Indirect questions
Ask them why they go there.
Ask her if she enjoyed the party.

5. Yes/No Questions
A common question that can be answered simply with “Yes” or “No” is called a Yes/No question in English.
Examples:
Do you like this city?
Do they know about your occupation?
Can you call the teacher?
Is it cold today?
Are they ready for the match?

The answer to Yes/No questions depends on the verb used in the question and you can simply answer by “Yes, I do” or “No I don’t like this city.”
Moreover, when the question begins with the form of be verbs (Is, Are, or Am) then the answers can be “Yes, I am/ she is/ we are” or “No, I am not,/he is not, we are not”. The same way you can answer for past be verbs (Was and Were).

If the Yes/No question contains auxiliary verbs (do/does, did, will, have/has) you can answer with yes or no using the same verb.

Did she clean the table? — Yes, she did/ No she didn’t.
Have you washed the dishes? — Yes, I have/ No, I haven’t.
Will they come on time? — Yes, they will/ No they won’t.

6. WH- Questions
WH questions are very common in English and we use them in our daily conversation. If we want to get some information about someone or something we ask with the help of WH questions.

What: “What” is used to ask about things or facts.
What is this?

Which: “Which” is used to ask about choice or selection?
Which book do you want?

When: “When” is used to ask about time.
When is your birthday?

Where: “Where” is used to ask about the place.
Where were you born?

How: “How” is used to ask about condition or quality.
How are you feeling now?

Why: “Why” is used to ask about reason or purpose.
Reason:
Why are you upset?
Because I failed the test.
Why is she happy today?
Because she passed the final test.

7. Tag Questions
The tag question or question tag is a phrase added to the main part of the sentence. They are not questions but are put with the statement in a sentence to keep the conversation going and make a comment. Tag Questions / Question Tags are frequently used in spoken English when you want to confirm something, but not in formal written English. So, we can define question tags as follows:

Tag Question/ Question Tag is a short question that is used for confirmation.
How to Form Tag Questions?

1. If the statement is positive, then the question tag will be negative
You are a teacher, aren’t you?

2. If the statement is negative, then the question tag will be positive.
He isn’t a teacher, is he?

3. Check the kind of verb used in the statement. If the auxiliary verb is used in the states follow the same verb in tag questions.
They have won the match, haven’t they?

4. If the statement is without auxiliaries, then (doesn’t, don’t, didn’t) are used in the question tags.
Ali likes reading books, doesn’t he?
They postponed the test, didn’t they?
They play cricket on weekends, don’t they?

How to respond to tag questions?
Question tags are used to keep a conversation going, you can agree or refuse a sentence with a question tag. To agree or refuse possible answers are Yes or No.
They are from Pakistan, aren’t they?    (Yes, they are/ No, they aren’t)

8. Choice Questions
Choice questions are types of questions that offer a choice of several options as an answer. You might recognize them from your exam “MCQs” multiple-choice questions. Choice questions are made of two parts which are mostly connected with the conjunction “Or“.
Does she like ice cream or chocolate? – She likes chocolate.
Where would you go, to the park or the zoo? – I would go to the park.
Do you make it or do I? – I do.
Did she buy the car or did they? – They did.

9. Rhetorical Questions
Rhetorical questions are used for expression or stylist purposes only. They don’t expect any answer and this is the reason that they are mostly ended with an exclamation mark instead of a question mark.
What! I have won the game?
Coach: I think we better cancel the match today.
Players: What? But we are fully prepared for it.
Is she really serious?

10. Hypothetical Questions
Hypothetical questions are used to draw out beliefs and opinions about an imaginary condition or situation that doesn’t exist and these questions are based on supposition.
These types of questions are also used in the context of events and situations that haven’t occurred yet. Therefore asks the opinion of the respondent to express how he or she would handle a hypothetical situation or event that might occur in the future.
What would you do if you lost the game?
Would you go out for a picnic if it didn’t snow?
If you had a million dollars, what would you buy?