The cat jumped when it saw itself in the mirror.
Can a wound really heal itself?
The word dining can be put in a sentence. That itself is a sentence.
falling intonation
The statement was a contradiction in itself.
I love life itself.
The cat groomed itself
It depends how you use it. If you use it after something it can be correct. But being in a sentence by itself isn't correct.
You have just done so in the question itself.
Europe had divided itself into teo sides
What I meant is that to square a number you multiply the number by itself.
If you septuple 10 you will get 70, as it make it 7 times itself.
A sentence is too general when you use too many pronouns. Tis only applies if it is out of context, though. For example: He knew she was thinking about it. If you hear this sentence by itself, you don't know who he is, who she is, or what it is. If this was in a paragraph, It may be obvious what these things are, but by itself the sentence is very vague.
In order to calculate the circumference of a circle multiply the radius by itself, then pi.