Common mistake How many cards are (is) that?

Common Grammar Mistakes: Agreement Errors

Correctly using subject-verb agreement is an essential aspect of English grammar. However, there are several common mistakes that people often make, leading to agreement errors. In this article, we will discuss one specific type of agreement error: the inconsistency between singular and plural forms.

The "is" vs. "are" Dilemma

One common mistake occurs when a subject is incorrectly paired with the wrong verb form. For instance, let's consider the following sentence:

How many cards are that?

In this example, the verb form "are" does not agree with the subject "how many cards." Since "how many cards" is a plural noun phrase, it should be paired with the plural form of the verb, which is "is." Therefore, the correct sentence should be:

How many cards is that?

Here, the verb "is" matches the singular noun "card" correctly. By paying attention to subject-verb agreement, you can ensure that your sentences are grammatically sound.

An Effective Grammar Checker: Linguix

To help you avoid agreement errors and other common mistakes, consider using a reliable grammar checker like Linguix. Linguix is an advanced tool designed to analyze your writing instantly and provide suggestions for improvement. Whether you are a student, a professional, or simply someone who wants to enhance their grammar skills, Linguix can help you achieve accurate and error-free writing.


Subject-verb agreement can be tricky, but with practice and the aid of helpful tools like Linguix, you can improve your grammar skills and eliminate common agreement errors in your writing. Remember to use the correct verb form that matches the subject, whether it is singular or plural. Happy writing!

How many cards are (is) that? mistake examples

  • Incorrect:
    How many cards are that?

    How many cards is|was that?

  • Incorrect:
    How many people does these changes effect?

    How many people do these changes effect?

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