instruction: Is the next sentence syntactically and semantically acceptable?

I often have eaten muffins.

response: acceptable


instruction: Is the next sentence syntactically and semantically acceptable?

They think she is too much happy.

response: unacceptable


instruction: Is the next sentence syntactically and semantically acceptable?

John believes that Bill saw himself.

response: acceptable


instruction: Is the next sentence syntactically and semantically acceptable?

The cottage which did Mrs Dashwood accept was rather small.

response:
unacceptable