1.The fire has burnt (burn) hundreds of trees since it started (start) two days ago .
2.Since the volcano erupted (erupt) on Frinday ,rocks and lava have destroyed (destroy) three villages in the area .
3. Since the flood waters began ( begin ) to go down , a lot of people have returned (return ) to their houses .
4. We haven ' t seen (not see) her since she left (leave ) the city .
5. Heve you gone (go) back to school since the hurricane stopped(stop)?