Present perfect tense s+have/has+v3
1. some companies (use) windmills or other equipment that do not pollute the air
2. extreme water shortages, or droughts (occur) in gunung kidul for a long time
3. people (realise) that they should plant more trees
4. people (cut down) trees for fuel, and their fires release gas into the air
thanx
1. some companies (use) windmills or other equipment that do not pollute the air
2. extreme water shortages, or droughts (occur) in gunung kidul for a long time
3. people (realise) that they should plant more trees
4. people (cut down) trees for fuel, and their fires release gas into the air
thanx
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2. extreme water shortages, or droughts has occured in gunung kidul for a long time
3. people have realised that they should plant more trees
4. people have cut down trees for fuel, and their fires release gas into the air