Say is replaced by a verb of command/request: "advise, recommend, ask, beg, command, encourage, forbid, invite, order, remind, request, tell, urge, warn" require object + to-infinitive
Verb of command/request/advice + object (without prep.) + (not) to-infinitive:
- He said, ‘Go away!’ > He told me to go away
‘say/tell + that + Subj + should’:
- He said, ‘Sit down, John > He said (that) John should sit down
Negative: not + to-infinitive:
- He said, ‘Don’t sit down' > He told me not to sit down