POSSIBILITY
1ère Bac Sciences et Technologies Mécaniques STM
📌 Introduction
We use special expressions to talk about present and past possibility — things that might be true now or might have happened in the past.
Present: “He might be at school.” (I’m not sure)
Past: “She might have gone home.” (I think so, but I don’t know)
📚 Expressing Possibility
Past: might/could + have + past participle
Examples:
- He might be tired. (Present)
- She could be at the library. (Present)
- They might have left. (Past)
- He could have forgotten the meeting. (Past)
Note: “Might” and “could” are often interchangeable for possibility.
✅ Exercise 1: Identify Present or Past
1. He might be at home. →
2. She could have missed the bus. →
3. They might go to the park. →
4. He could have studied harder. →
5. She might be sick. →
✅ Exercise 2: Complete with “might” or “could”
1. He ___ be late.
2. She ___ know the answer.
3. They ___ win the game.
4. It ___ rain tomorrow.
5. We ___ pass the exam.
✅ Exercise 3: Present Possibility
1. I don’t see him. He ___ be in class.
2. She isn’t answering. She ___ be busy.
3. They aren’t here. They ___ be late.
4. The light is on. Someone ___ be home.
5. He looks tired. He ___ need rest.
✅ Exercise 4: Past Possibility
1. He didn’t come. He ___ have been sick.
2. She didn’t answer. She ___ have been sleeping.
3. They left early. They ___ have finished.
4. The door was locked. They ___ have gone out.
5. I didn’t see them. They ___ have left already.
✅ Exercise 5: Complete the Sentence
1. He isn’t here. He ___ be at the library.
2. She didn’t call. She ___ have forgotten.
3. The phone is ringing. It ___ be important.
4. They didn’t finish. They ___ have run out of time.
5. He looks happy. He ___ have passed the test.
✅ Exercise 6: Fill in the Blank
1. She ___ be at home. I saw her light on.
2. He didn’t come to school. He ___ have been ill.
3. They ___ know the answer. They look confused.
4. The experiment failed. They ___ have made a mistake.
5. I don’t see my book. I ___ have left it at school.
✅ Exercise 7: Correct the Mistake
1. He might be sick yesterday. →
2. She could be late tomorrow. →
3. They might have go to the park. →
4. He could have forget the meeting. →
5. She might be at home last night. →
✅ Exercise 8: Science Context
1. The experiment failed. They ___ have made a mistake.
2. The data is missing. Someone ___ have deleted it.
3. The results are good. They ___ have followed the procedure.
4. The lab is empty. The scientist ___ be on break.
5. The equipment broke. It ___ have been old.
✅ Exercise 9: Real-Life Situation
1. Your friend didn’t answer your call. →
2. The lights are off at home. →
3. Your teacher is late. →
4. You can’t find your keys. →
5. Your classmate looks sad. →
✅ Exercise 10: Write a Sentence
Use “might” or “could” correctly:
1. (present)
2. (past)
3. (present)
4. (past)
5. (present)
