tell what happened
Du darfst Tom nicht sagen, was geschehen ist.
You mustn't tell Tom what happened.
Ihr solltet mir lieber sagen, was geschehen ist.
You’d better tell me what happened.
Jemand muss Tom sagen, was geschehen ist.
Someone has to tell Tom what happened.
Ich habe Tom das Versprechen abgenommen, niemandem zu sagen, was geschehen ist.
I got Tom to promise not to tell anyone what had happened.
Ich habe beschlossen, Tom zu sagen, was geschehen ist.
I decided to tell Tom what happened.