Embedded Questions

 - An embedded question is a question that is included inside another question or statement.

- Usually they are use after an introductory paragraph, such as:

I wonder
Could you tell me
Do you know
Can you remember
Let's ask
We need to find out
I'd like to know

There are certain rules in order to use an embbededed question correctly.

1- In first place, if the embedded question is a part of a statement, it is necessary to use a period at the end not a question mark. Also, it is necessary to omit auxiliary verbs, such as do, does or did, and use the verb in the appropiate form.

Ex: 

Direct Question	What time did he leave?
Embedded Question	I wonder what time he left.

2- Secondly, If the embedded question includes the verb to be, it is necessary to reverse the position of the subject and the verb.

Ex: 

Direct Question	Can you help me?
Embedded Question	I wonder if you could help me.

Direct Question	Is he a doctor?
Embedded Question	Do you know if he is a doctor?

3- Thirdly, when there is no question word in the sentence, embedded questions should be introduce by whether, whether or not, or if.

Ex:

Direct Yes/No Question	Will he be there?
Embedded Question	Do you know if he will be there? Do you know whether or not he will be there? Do you know whether he will be there or not?

4- Finally, in embedded questions an infinitive can follow a question word.

Ex: 

Direct Question	What should I do?
Embedded Question	Please tell me what I should do.
Embedded Question with an Infinitive	Please tell me what to do.

My experience: 

I found this topic a bit complex, since there are different rules and structures to make an embbededed question correctly. However, with practice and analyzing the examples it is quite easy to understand.

(click here to watch a video about embedded questions)