1. (position). I am sitting in the room; in a house; in London, etc.
2. The things were piled in a heap.
3. He is badly in debt, but is in good health.
4. His answer was in the negative.
5. This is his letter in reply to mine.
6. You have come just in time to help me.
7. This happened in the reign of the Queen.
Please attend my class to learn the techniques of memorizing and usage.