TL:

1. He advised/warned the boys not to swim out too far 

-> advise sb + (not) to V

-> warn sb + (not) to V 

2. She reminded me to go to the supermarket after work

-> remind sb + (not) to V 

3. He invited Jane to come on a picnic with them

-> invite sb + to V 

4. He threatened not to give me the money back if I keep on at him

-> threaten to V 

`31,` He warned the boys not to swim out too far.

`+` S + warned + O + (not) + to + V1: cảnh cáo ai đó (không) làm gì

`32,` She reminded me to go to the supermarket after work.

`+` S + reminded + O + (not) + to + V1: nhắc ai đó (không) làm gì

`33,` He invited Jane to come on a picnic with them.

`+` S + invited + O + to + V1: mời ai làm gì

`+` Us `→` them

`34,` He threatened not to give me the money back if I keep on at him.

`+` S + threatened + O + (not) + to + V1: đe dọa ai (không) làm gì

`+` You `→` Me, I; me `→` him