Would a linguist find the following sentence to be a valid English sentence grammatically?

There's going to be a party, isn't there?
OPTIONS:
- unacceptable
- acceptable
acceptable
Skulle en lingvist finna följande mening vara en giltig engelsk mening grammatiskt? Det blir fest, eller hur? ALTERNATIV: - oacceptabelt - godtagbart
Would a linguist find the following sentence to be a valid English sentence grammatical? There's gonna be a party, isn't there? ALTERNATIVES: - unacceptable - acceptable
kan godtas
Acceptable