Page 3: ... However such issues can still arise – as was seen in the Brown case, considered later, and the ongoing issue of the ‘rights’ relating to assisted suicide...
3. This was originally question 3 here: such issues is plural, so why's the verb (after 'as') singular? Is this verb called the copula?
User StoneyB kindly replied:
The verb is singular because its subject is singular.
Is "such issues can still arise" "the entire superordinate clause" in StoneyB's words? I do accept this as the subject, but how can clauses have grammatical number? What does this mean?