1 is fine, but 2 doesn't make sense.
3 and 4 are pretty much the same.
1. You should do it yourself.
2. You should do it itself.
Are both grammatical?
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3. She must be angry because she's not saying anything.
4. She has to be angry because she's not saying anything.
Are both grammatical and commonly used?
4 answers
Thank you for your help.
5. He hit the boy himself.
6. You should eat the apple itself.
Are the sentences grammatical?
5. He hit the boy himself.
6. You should eat the apple itself.
Are the sentences grammatical?
7. I like the boy themselves.
What about this sentence?
What about this sentence?
5 means that the subject hit the boy; no one else hit the boy.
6 doesn't make sense; remove "itself."
7 doesn't make sense either; remove "themselves."
6 doesn't make sense; remove "itself."
7 doesn't make sense either; remove "themselves."