Through:
* Movement or passage: Used when something passes from one point to another, often across a physical barrier or space.
* "She walked through the park."
* "The water flowed through the pipe."
* Time: Used to indicate duration or a period of time.
* "He worked through the night."
* "The project was completed through the collaborative efforts of the team."
* Means or agency: Used to express how something is accomplished or achieved.
* "He achieved success through hard work."
* "The message was sent through email."
In:
* Location or enclosure: Used to indicate being inside or within a specific place.
* "The book is in the library."
* "The cat is sleeping in the basket."
* State or condition: Used to describe a state of being.
* "He's in trouble."
* "The car is in excellent condition."
Examples:
* Correct: "The ball went through the window." (Movement)
* Correct: "The project was completed in two weeks." (Time)
* Correct: "They communicated through text messages." (Means)
* Correct: "The key is in the drawer." (Location)
* Correct: "The patient is in critical condition." (State)
Let me know if you have any more questions or need further clarification!