Grammar - Clauses as Subjects.

Clauses can act as subjects of verbs. They usually take a singular verb:
That such things should occur is surprising.
To treat 18-year-olds as children is patronising.
Caring for all aspects of home and family takes a lotof time.
What-clauses are different, however. Here agreement depends on whether the clause refers to a thing or to several things:
What was their garden is now a car park.
What seemed good reasons at the time now look
unconvincing. (That is, the reasons now look unconvincing.)
Sometimes you can choose, especially when the complement of the main verb is plural, though the singular form remains slightly preferable.
When we need is/are donations – Donations are what we need.
What I saw was/were two enormous balloons – Two enormous balloons were what I saw.
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