"everybody", "nobody", "no one" - plural or singular

[Coachella]

I am completely confused about the usage of these indefinite pronouns. Some websites tell that I should use the plural form of verbs and possessive pronouns with them while others tell me the exact opposite.

For example, is it correct to say " nobody can be called a happy person if there is no one who sincerely love and support them" or should I say " Nobody can be called a happy person if there is no one who sincerely loves and supports him"?
or another example : " Everyone should find their own style to express their individuality" or "Everyone should find his own style to express his individuality"?
and one extra , kind of similar question via example sentence : "It might be difficult to use public transport for a person if the person has children with him/them?"

Please, help me clerify the rules.

 

[Tdol]

Re: "everybody", "nobody", "no one" - plural or singular

Use a singular verb: Everybody/no one/nobody knows

Them and their are often used with the singular when the gender is not known or important: Someone has left their umbrella behind. (One person) Traditionally, his would be used here. You could also use his or her, but that is a lot of words, so their solves the problem:

Everyone should find his own style to express his individuality. (Traditional form. Some people dislike it and think it is old-fashioned.)
Everyone should find his or her own style to express his or her individuality. (Wordy way of accounting for gender)
Everyone should find their own style to express their individuality. (Simple way of doing it. Some people dislike the use of a plural for a singular, but it's becoming more and more common)

 

[Coachella]

Re: "everybody", "nobody", "no one" - plural or singular

Thank you very much!

 

[Rover_KE]

Re: "everybody", "nobody", "no one" - plural or singular

Your appreciation is welcome, Coachella, but there is no need to write a new post to say Thank you. Simply click the Thank button on any posts you find helpful. It means that we don't have to open the thread again to read your new post and then find that it doesn't include any new information or an additional question.

It saves everybody's time.