Learning to use Can and Can't (Cannot)


Welcome to the WebQuest "Learning to use 'Can' and 'Can't'" in which we explore two fundamental concepts in the English language: the ability to do something ("can") and the impossibility of doing it ("can't"). These two modal verbs are essential for communicating effectively in English and are used in a wide variety of everyday situations. Through this WebQuest, students will have the opportunity to understand and practice how to use "can" and "can't" correctly in different contexts.

The main objective of this WebQuest is for students to gain a solid knowledge of the use of "can" and "can't" in English. At the end of the activity, students should be able to:

  • Understand the fundamental difference between "can" (be able to do something) and "can't" (not be able to do something) in English.
  • Use "can" and "can't" appropriately in simple sentences.
  • Identify everyday situations in which the use of "can" and "can't" can be applied.
  • Express yourself clearly and precisely using these two modal verbs in oral and written communication situations.
  • Throughout this WebQuest, students will participate in interactive activities, practical exercises, and contextualized examples to strengthen their understanding and skills in using "can" and "can't" in English.

To complete Task-content check and read the Teacher Page.

1° Exercise.


2° Exercise



Task 1: Introduction to Can and Can't'

Description: In this introductory task, students must read a brief explanation about the use of "can" and "can't" in English. This may include examples and an explanation of the fundamental difference between the two terms.

Task 2: Capability Identification

Description: Students must see a series of images that represent people doing various activities. They must identify which activities people can do ("can") and which they cannot do ("can't").


In this WebQuest, we have explored the use of the modal verbs can and can't in English, two words that play a fundamental role in everyday communication. We have learned that "can" is used to express the ability or ability to do something, while "can't" indicates the impossibility or lack of ability to perform an action. Throughout this learning adventure, students have had the opportunity to develop their skills in using these modal verbs through various interactive tasks and activities.

It is important to remember that mastery of "can" and "can't" is essential for fluency in English and for effective communication in a variety of contexts, whether in personal, academic, or professional situations.

As you continue your journey in learning English, we encourage you to continue practicing and applying what you have learned here. Remember that knowledge is a constant path of growth and development.

Thank you for participating in this WebQuest. We hope you enjoyed this educational experience and that you strengthened your skills in using can and can't. Congratulations on your dedication and effort!



Teacher Page

Possibility and impossibility

We use can't or cannot to say that something is impossible:  (British Council,2010)

That can't be true. 
You cannot (can't) be serious. 


We use can and can't to talk about someone's skill or general abilities. (British Council,2010)

She can speak several languages.
He can swim like a fish.
They can't dance very well.