1. No boy is faster than me in my class.

2. No one is faster than me in my class.
3.No boys are faster than me in my class.
4. Nobody is faster than me in my class.
5. Noone is faster than me in my classl.

(Which ones are correct and commonly used?)

i think it is 1,2 and 5

Change "me" to "I" in all of the sentences. What all of these sentences mean is No boy is faster than I am.

Also, the phrase "in my class," should be immediately after the subjects. This is an adjective phrase modifying the subject.

Out of the five options, all of them are grammatically correct and commonly used. However, the most commonly used and recommended options are:

1. No boy is faster than me in my class.
2. No one is faster than me in my class.
4. Nobody is faster than me in my class.

These options are more commonly used because they are more inclusive and gender-neutral. They refer to both boys and girls in the class, making them more suitable for general statements. However, if the context specifically refers to only boys in the class, then option 3 - "No boys are faster than me in my class" - can also be used. Option 5 - "Noone is faster than me in my class" - is less commonly used and could be considered a typographical error, as it should be spelled as "No one."