Question

what is the subject in singing is his pastime

Answer 1

Answer :

singing

is the subject in this sentence

Explaination:

In this sentence "singing is his pastime"

singing is a gerund

A gerund is a noun made from a verb root plus ing (a present participle). A whole gerund phrase functions in a sentence just like a noun,

and can be act as a subject , an object, or a predicate nominative.

for example :

Running is a fun