B. PRESENT PERFECT (has / have + PP(V3/Ved) 1. They have just built a new hospital near the airport. ? 2. He hasn’t seen the younger son for three weeks. ? 3. Workers have built a new bridge in this area. ? A new bridge 4. The scientists have studied this problem carefully. ? This problem 5. Hoa has already told him the whole truth. ?He

1, A new hospital has just been built near the airport

2, the younger son hasn't been seen for 3 weeks

3, a new bridge has been built in this area by workers

4, this problem has been studied cảefully by the scientists

5, he has been already told the whole truth by Hoa

1. They have just built a new hospital near the airport.

?     A new hospital has just been built near the airport.

2. He hasn’t seen the younger son for three weeks.

?   The younger son hasn't been seen for 3 weeks.

3. Workers have built a new bridge in this area.

? A new bridge has been built in this area by workers.

4. The scientists have studied this problem carefully.

? This problem has been studied carefully by the scientists.

5. Hoa has already told him the whole truth.

?He he has been already told the whole truth by Hoa.