Updated on March 13, 2025
by PushtoLearn
Test your English

Plural of Series

Many English learners get confused about the plural form of series because it already ends in -s in its singular form. Unlike regular nouns that simply add -s or -es to become plural, series follows a different rule.

Confusing Plural Forms Exercise

This exercise focuses on confusing plural forms, including Series.

TLRD

Singular and Plural Forms

Singular

Plural

a series

two series

one series

several series

Yes, the singular and plural of series are spelled the same! The difference is in the context and the words around it.

Illustration of Plural of Series

How to Use "Series" in Sentences

Singular Example:

✅ This TV series is very popular.
✅ A new series of books will be released next year.

Plural Example:

✅ I have watched several TV series this year.
✅ The scientist conducted multiple series of experiments.

Even though the word doesn’t change, the verb does!

  • Singular: "This series is exciting."

  • Plural: "These series are interesting."

Common Mistakes

❌ "Two serieses" (Incorrect) – Series does not take -es at the end.
❌ "A series are great." (Incorrect) – When singular, use is, not are.
❌ "One serie" (Incorrect) – The singular is still series, not serie.

When to Use "Series"

  1. TV Shows & Books – "I love the Harry Potter series."

  2. Scientific Research – "She conducted a series of tests."

  3. Sports Events – "The baseball series was thrilling."

  4. Chronological Events – "A series of accidents caused the delay."

FAQs

What is the plural form of series?

The plural of series is still series. The word does not change.

Do we say "this series is" or "this series are"?

We say "this series is" because series is singular in this case.

Can "series" be both singular and plural?

Yes! "A series" is singular, but "multiple series" is plural.

What is the singular form of series?

The singular form is series (not "serie").

How do you use "series" in a sentence?

Example: "This series is my favorite" (singular) and "All these series are interesting" (plural).

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