'The bag of books are heavy' (thinking 'books' is subject)
Correct: 'The bag of books IS heavy' (subject is 'bag', not 'books')
Quick Identification Method:
Cross out prepositional phrases (of, in, on, at, with, by, for) to find the real subject.
'The leader of all political parties' → Cross out 'of all political parties' → Subject is 'leader' (singular)
Special Cases to Remember:
- None can be singular or plural depending on context
- Each, every, either, neither are always singular
- Data can be singular (modern usage) or plural (traditional)
- Scissors, trousers, spectacles are always plural
Exam Success Strategy:
In error detection questions, immediately scan for subject-verb mismatches. This appears in 60% of grammar-based error detection questions in SSC CGL. Practice identifying the main subject by eliminating prepositional phrases and modifying clauses.