1. I sold that pencil yesterday.
- Simple past tense: I sold that pencil yesterday.

2. I slept at my grandmother's house last week.
- Simple past tense: I slept at my grandmother's house last week.

3. I'm walking to the park, it's very beautiful.
- Present continuous tense: I am walking to the park, it is very beautiful.

4. I will bring this umbrella to school because it will rain tomorrow.
- Simple future tense: I will bring this umbrella to school because it will rain tomorrow.

5. I have been studying English for 10 years.
- Past perfect tense: I have been studying English for 10 years.

6. I have been studying English for 10 years.
- Present perfect tense: I have been studying English for 10 years.

7. I finished my homework before I went out.
- Past perfect tense: I finished my homework before I went out.