Study the examples and the rules. Write present perfect or past simple for 1-6.

1. I decided my subjects a long time ago. _____

2. I haven’t decided anything. _____

3. I gained a lot of confidence when I was there. _____

4. I’ve gained a lot of confidence this year. _____

RULES 

We use the (5) _____ when we talk about finished time periods.

We use the (6) _____ when we talk about unfinished time periods or when we don’t mention a time period.