Put the verbs in brackets into the Present Perfect Continuous form. 1. It ______ (rain) for two hours. 2. How long ______ (you/build) nesting boxes? 3. I ______ (donate) to environmental organisations for the last five years. 4. Sally ______ (volunteer) at the zoo for a year already! 5. The students ______ (try) to reduce pollution. 6. Acid rain ______ (destroy) natural habitats for years.

Resolution:

• 1. It has been raining for two hours. (The action started in the past and continues to the present).
• 2. How long have you been building nesting boxes? (Focus on the duration of the ongoing action).
• 3. I have been donating to environmental organisations for the last five years. (The action has been happening for a period of time and may continue).
• 4. Sally has been volunteering at the zoo for a year already! (Emphasizes the duration of Sally's volunteering).
• 5. The students have been trying to reduce pollution. (The action of trying has been ongoing).
• 6. Acid rain has been destroying natural habitats for years. (Highlights the continuous negative impact over a long period).

Final Answer: has been raining, have you been building, have been donating, has been volunteering, have been trying, has been destroying