Dear Carinita,
1. �A key feature of this play is dreams�.
2. �A key feature of this play are dreams�.
My first inclination was to say that:
1. �A key feature of this play is dreams�, is the correct sentence, because �A feature� is singular, so it takes �is�.
But then I reversed the sentences and had:
1. �Dreams is a key feature of this play�.
2. �Dreams are a key feature of this play�.
It seemed that 2,
�Dreams are a key feature of this play�, was correct.
Then I re-wrote sentence 1,
�Dreams is a key feature of this play�.
�Dreaming is a key feature of this play�.
�To dream is a key feature of this play�.
�Hallucinating is a key feature of this play�.
�Imagining visions whilst you are asleep is a key feature of this play�.
I convinced myself! In my opinion, the correct sentence is:
1. "A key feature of this play is dreams".
I agree with Tech Teacher and Suha!
LES