I saw a printed T-Shirt with this sentence:
The best things in life are free wifi
I think it is not quite right. My arguments are:
- "Free" modifies "wifi", which means that "free" is an adjective and has no bearings on the verb form. "Wifi", however, is an uncountable noun, which means that it should always take a singular verb form. And this sentence used "things", that means it is a grammatical error. This sentence should be:
The best thing in life is free wifi
Because if "free wifi" should always take a singular verb form, in this case To Be -> "is", then the verb should belong to a singular subject, that's why "things" is wrong here.
- So if the subject is still "things", then the object has to be plural (the list of things), something like:
The best things in life are cookies
or, for example
The best things in life are free wifi and free education
Of course, if the original printed text has a special meaning to make us confused.