Slide 1: Lesson 2A: Present Perfect Simple & Continuous. Slide 2: What are Present Perfect Tenses?. Slide 3: Present Perfect Simple: Formation. Slide 4: Uses: Present Perfect Simple. Slide 5: Present Perfect Continuous: Formation. Slide 6: Uses: Present Perfect Continuous. Slide 7: Simple vs. Continuous: Key Differences. Slide 8: When to Choose: Simple or Continuous?. Slide 9: Signal Words: Present Perfect Simple. Slide 10: Signal Words: Present Perfect Continuous. Slide 11: Common Mistakes to Avoid. Slide 12: Practice Time: Fill in the Blanks (Simple). Slide 13: Practice Time: Fill in the Blanks (Continuous). Slide 14: Practice: Simple or Continuous?. Slide 15: Summary: Present Perfect Tenses. Slide 16: Q & A and Thank You!