Montreal, canada today we're celebrating buy nothing day at our school by holding an eco-bazaar. we have been working hard on it all week. all the students have brought in a few items from home that are still in good condition. we receive coupons in return for each item. now we are using the coupons to buy other things. erica, 15 birmingham, england we have decided to do simple things on buy nothing day. we've walked to school instead of taking the bus and we've asked our parents not to go to the supermarket. james, 16 найти в тексте примеры present perfect и present perfekt continuous !

Present Perfect образуется при вс глагола have/has + V3 (глагол в третьей форме). В тексте несколько предложений в данном времени:
All the students have brought in a few items from home that are still in good condition.
We have decided to do simple things on Buy Nothing Day. 
We've walked to school instead of taking the bus and we've asked our parents not to go to the supermarket. 

Present Perfect Continuous образуется при В тексте одно предложение в данном времени.
We have been working hard on it all week.