Today I have learned about subjects in English which look plural but may be singular. Quite confusing,of course.;)
For example, the word "Physics" is almost always a singular, as in
a)"Physics was his field".
But there are cases when it is plural. Like this..
b)"The physics of the device are sophisticated".
a)." Five boys are playing".(plural)
b). " Five boys is not enough even for a scrub game".(singular)
There are many,many more such words.My mind had been cluttered with grammatical principles and I had lost in the modern English rules. Hehe. ;)