Sentence: John is prouder of having gone than than John expected me to believe not all.
OPTIONS:
- unacceptable
- acceptable

Linguistic integrity: unacceptable

Sentence: Fred must both have been singing songs and have been drinking beer.
OPTIONS:
- unacceptable
- acceptable

Linguistic integrity: acceptable

Sentence: That Jack ever slept is impossible.
OPTIONS:
- unacceptable
- acceptable
Linguistic integrity: acceptable