70. My boss is in the office. He is
wearing a red shirt. (who)
-> My boss,who is wearing a red shirt, is in the office.
1. I've never met any more dependable person than George.
=> George is the most dependable person that  I've never met
2. Tim drinks too much alcohol everyday, that's why he has a lot of stomach
problems.
=> If Tim didn't drink  too much alcohol everyday, he wouldn't have a lot of stomach
problems.
3. The shop assistant handed these boxes to the customer.
=> These boxes were handed to the customer by the shop assistant