In this lesson, students will explore how to describe past actions and efforts using the sentence "The detective did a lot of research to solve the mystery." This phrase helps express how someone tried hard to find the truth. Learners will use past simple, present continuous, future forms, and modal verbs to discuss investigations and problem-solving.
Examples:
The detective did a lot of research to solve the mystery.
He found many clues in the old library.
She is reading the report now.
They will interview more witnesses tomorrow.
🧠GRAMMAR
Past Simple
He found new evidence yesterday.
The detective didn’t stop working until late.
Present Continuous
She is talking to the witness.
They are analyzing the fingerprints now.
Future with Will / Going to
We will discover the truth soon.
They are going to look at the video again.
Modal Verbs
We must follow all the clues.
She can solve difficult cases.
You shouldn’t ignore small details.
He can’t guess the answer without proof.
Comparatives / Superlatives
This case is more complicated than the last one.
It’s the most interesting mystery we’ve had this year.
Adverbs & Prepositions
He always checks the facts carefully.
The papers were hidden under the desk.
📚 VOCABULARY (10 Words with Definition)
| Word | Definition |
|---|---|
| Detective | A person who investigates and solves crimes |
| Research | Careful study to discover new facts or solve problems |
| Clue | A piece of evidence or hint that helps solve something |
| Mystery | Something strange or unknown |
| Witness | A person who saw something happen |
| Evidence | Facts or signs that show something is true |
| Case | A problem or situation for investigation |
| Report | A written or spoken description of an event |
| Suspect | A person who may be involved in a crime |
| Solve | To find the answer to a problem |
💬 USEFUL EXPRESSIONS
The detective worked hard on the case.
That clue helped solve the mystery.
There isn’t enough evidence.
He did a lot of research.
They found something unusual.
It was not an easy case.
We must look at everything carefully.
Let’s ask more questions.
✏️ SENTENCES
Positive:
The detective did a lot of research.
They found new evidence yesterday.
Negative:
He didn’t ignore the small details.
There wasn’t enough information before.
Questions:
Did the detective solve the mystery?
What did they discover?
Will they find more clues tomorrow?
Answers:
Yes, he solved it last night.
They found a secret letter.
Maybe, they are going to search the basement.
🗣️ LONG CONVERSATION
Emma: Did you hear about the new case?
Noah: Yes! The detective is working on it now.
Emma: I heard he did a lot of research last week.
Noah: That’s true. He found some interesting clues in the old house.
Emma: Do you think he’ll solve it soon?
Noah: I think so. He’s going to interview the last witness today.
Emma: That’s exciting. I love a good mystery!
Noah: Me too. Let’s see what happens next!
📖 LONG READING
Title: The Case of the Missing Painting
Last month, a famous painting disappeared from the city museum. People were shocked, and the museum was closed for days. The detective on the case worked day and night. He did a lot of research and checked the security cameras. He also talked to every person who was in the museum that day.
One week later, he found a small clue: a glove near the back door. With more research, he discovered that one of the workers left early that day. The detective asked questions, followed the trail, and finally found the painting in a storage room.
Everyone was happy and thanked the detective. The mystery was solved!
Questions and Answers:
What disappeared from the museum?
→ A famous painting.What did the detective do?
→ He did a lot of research and talked to people.What clue did he find?
→ A glove near the back door.Who left early that day?
→ One of the workers.Where was the painting found?
→ In a storage room.
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