Learn how to use one and a half correctly with nouns and verbs, exploring both traditional grammar rules and modern usage exceptions.
What is "One and a Half" and How Does It Work?
There is no dispute about one and a half that it takes the plural noun.
- I've been waiting for one and a half hours.
Alternatively, you can use the structure An/A + singular noun + a half:
- I've been waiting for an hour and a half
However, after One and a half + plural noun, there is confusion about whether the verb will be singular or plural.
Traditional vs. Modern Rules for Subject-Verb Agreement
When constructing sentences involving one and a half, grammatical norms differ between traditional standards and modern usage.
| Grammar Standard | Rule Formula | Example |
|---|---|---|
| Traditional Grammar | one and a half + plural noun + singular verb | One and a half lemons was enough. [Subject-Verb agreement in P C Das's book or see Grammar by P K De Sarkar] |
| Modern Norms | One and a half + plural noun + plural verb | One and a half hours are allowed for the exam. (Time allotted for the test is 1.5 hours) |
| Modern Alternative | A/An + singular noun + a half + singular verb | An hour and a half is allowed for the exam. |
What are the Exceptions for One and a Half?
When One and a half + plural noun means the sum of units of something, the verb will be singular.
In this case, both Traditional and Modern rules, will be singular verb.
- One and a half hours is a long time.
- One and a half miles is a long way.
Key Takeaways
- The phrase one and a half always precedes a plural noun (e.g., one and a half hours).
- Traditional grammar prefers a singular verb with one and a half + plural noun, while modern norms often accept a plural verb.
- When referring to a collective sum of units (like time or distance), both traditional and modern rules require a singular verb.
- An alternative phrasing is A/An + singular noun + a half, which takes a singular verb.
Quick Practice
Test your understanding by writing your own sentences using "one and a half" or "an hour and a half" in the comments below!
Frequently Asked Questions
Is it correct to say one and a half hours?
Yes, one and a half correctly takes a plural noun, making one and a half hours standard usage.
Should I use a singular or plural verb with one and a half?
Traditional grammar often uses a singular verb, modern norms accept plural verbs for examinations or measurements, and expressions representing a single sum of time or distance always take a singular verb.
What does one and a half hours mean?
It means 1.5 hours, representing a duration of one full hour plus an additional thirty minutes.