All, everything or everybody/ everyone.

A/- All and everybody/ everyone

We do not normally use all to mean everybody/everyone:

•   Everybody enjoyed the party, (not 'All enjoyed...')

 But note that we say all of us/ you/ them, not 'everybody of...':

• All of us enjoyed the party, (not 'everybody of us')

B/- All and everything

Sometimes you can use all or everything:

• I’ll do all I can to help,   or I’ll do everything I can to help.

You can say 'all I can' / 'all you need' etc. but we do not normally use all alone:

• He thinks he knows everything, (not 'he knows all')

• Our holiday was a disaster. Everything went wrong, (not 'All went wrong')

We use all in the expression all about:

• They told us all about their holiday.

We also use all (not 'everything') to mean the only thing(s):

• All I've eaten today is a sandwich. (= the only thing I've eaten today)

C/- Every/ everybody/ everyone/ everything are singular words, so we use a singular verb:

• Every seat in the theatre was taken.

• Everybody has arrived, (not 'have arrived')

 But we often use they/ them/ their after everybody/ everyone:

• Everybody said they enjoyed themselves. (= he or she enjoyed himself or herself)