TASK DEFINITION: You're given a sentence and your task is to classify whether the sentence is acceptable or not. Any sentence which is grammatically correct, has a naturalistic text, is written by a native speaker and which minimizes superfluous content is acceptable, otherwise unacceptable. If the sentence is acceptable then write "acceptable", otherwise "unacceptable".
PROBLEM: Susan will never sing at weddings.

SOLUTION: acceptable

PROBLEM: John is prouder of having gone than I expected you to believe he would be of not having fallen asleep.

SOLUTION: acceptable

PROBLEM: Ellen told Helen.

SOLUTION:
acceptable