instruction: Is the next sentence syntactically and semantically acceptable?

Sally eats pretty often the stuff.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I am anxious for you to arrive on time.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Ellen warned to Helen.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Bill reading Shakespeare satisfied me

response:
acceptable