34. My cousin started teaching Chemistry in September 2010.
⇒ My cousin has taught Chemistry since September 2010.
35. "I don't have to work this evening." My father said.
⇒ My father said that he didn't have to work that evening.
36. They should invite their classmates to the festival.
⇒ Their classmates should be invited to the festival.
37. The dictionary is very informative. You wanted to buy it two weeks ago.
⇒ The dictionary which you wanted to buy two weeks ago is very informative.
