Choose the correctly formed sentence using a gerund as the subject.
A
To swim is good exercise.
B
Swimming is good exercise.
C
Swim is good exercise.
D
Swimming are good exercise.
Correct Answer: Option B — Swimming is good exercise.
Explanation:
A gerund, formed by adding '-ing' to a verb, can function as a noun and act as the subject of a sentence, making 'Swimming is good exercise' the correct construction.