One example might be - Kevin lacked a lot of self motivation.
Another example may be - The general pressed the self destruction button.
Yes, "Did you hurt yourself?" is an interrogative sentence since it is in the form of a question. A declarative sentence would be "You hurt yourself." without the question mark.
"Cover yourself from harsh sun" is not a correct sentence. A better sentence with proper structure might be "Cover yourself to protect from the harsh sun".
Sure, here is a sentence using "you" and "yourself": "If you take care of yourself, you will be better equipped to help others."
I'm
To Yourself
I fear your teacher will detect that you did not write this sentence yourself.
You have done that yourself.
Do it yourself.
You can use the letter I in the middle of a sentence to describe yourself.
yo adulation yourself
Don't overestimate yourself!
You are deluding yourself.