Present perfect / past simple. use either the present perfect or past simple in the following sentences. a) past simple b) present perfect14. i’m not sure we ____ (to meet) before.15. you ____ (to be, always) my closest friend.16. when you _____ (to go) to brazil? 17. it’s two months since i _____ (to start) diving me car. 18. this is the first time i ______ (to eat) so many hamburgers.19. my father ______ (to work) for that company for 5 years. than he gave it up.20. i ______ (to use) to be afraid of dogs. 21. susan ______ (to use) to sit in her room and play the piano for hours.

Here are the correct forms for the sentences provided, along with a brief explanation for each choice to help clarify the usage of Past Simple and Present Perfect. Sentence Completions

1. I’m not sure we have met (to meet) before.
   • Explanation: Used for an indefinite time in the past; the focus is on the experience/result in the present.
2. You have always been (to be, always) my closest friend.
   • Explanation: Describes a state that started in the past and continues into the present.
3. When did you go (to go) to Brazil?
   • Explanation: The word "when" asks about a specific point in time, which requires the Past Simple.
4. It’s two months since I started (to start) driving my car.
   • Explanation: We use the Past Simple after "since" to refer to a specific point in time when an action began.
5. This is the first time I have eaten (to eat) so many hamburgers.
   • Explanation: We use the Present Perfect with the structure "This is the first/second/third time..."
6. My father worked (to work) for that company for 5 years. Then he gave it up.
   • Explanation: Even though it lasted for a duration ("for 5 years"), the action is completely finished and has no connection to the present.
7. I used (to use) to be afraid of dogs.
   • Explanation: "Used to" is a fixed past construction for finished habits or states; it functions like the Past Simple.
8. Susan used (to use) to sit in her room and play the piano for hours.
   • Explanation: Similar to the previous sentence, this describes a repeated past habit that no longer occurs.

Quick Reference Table

Would you like me to provide more practice sentences focusing specifically on the difference between "for" and "since"?