این هم تمرین ۴ و درس مربوطه بصورت تکست:Exercise 4 John…(1)… along Granville street yesterday, when he …(2)… two men …(3)…. Since he …(4)… someone …(5)…, he ...(6)… the police and reported the …(7)… .1. A.walked B.was walking C.walks D. has been walking2. A. saw B.sees C.was seeing D. has seen3. A. were fighting B. fought C. fighting D. has been fighting4. A. worry B. worried C. was worried D. has been worried5. A. could be hurt B.can hurt C. can be hurted D. could get hurt6. A. called B. was calling C. has called C. has been calling7. A. accident B. disturbance C. incident D. catastrophe-------------Lesson 4John was walking along Granville Street yesterday, when he saw two men fighting. Since he was worried someone could get hurt, he called the police and reported the incident.1. B 2. A 3. C 4. C 5. D 6. A 7. CThe highlighted text is called a dependent clause. It is a clause because it contains a subject and a verb and it is dependent because it cannot stand on its own. The word ‘fighting’ in this clause is a verb form acting as an adjective. This clause can be changed to “when he saw two men who were fighting”, but not to “when he saw two men were fighting”.