[a] Which is the best choice for the blank? [b] What's the best choice you have made? (TED) Which are the subjects in above respectively? It seems like which in [a] and what in [b] are ...
How do I determine subject and subject complement in “A side-effect is the spread of commercialese to other domains.”?
Consider this example: Commercialese is an instrument of art, designed to enrich and invigorate our language—surely you will all agree with this—, and we should encourage newcomers to learn ...