Q: Valid English sentence (grammatically) or not: Ellen conferred to Helen.

A: unacceptable

Q: Valid English sentence (grammatically) or not: Hank plays the guitar and finds arrangements for all the old folk songs which are still sung in these hills, and Ernie writes down all the old folk songs which are still sung in these hills.

A: acceptable

Q: Valid English sentence (grammatically) or not: What you want is a little greenhouse.

A:
acceptable