Can you put a couple of extra pencils in my backpack? If you put a couple of strawberries on top, the kids will gobble up the fruit salad! "Put a couple of signs around the neighborhood, and the yard...
The construction worker carefully put the finishing brick piece to complete the building project. OR, in another sense of "put": "He decided to put his answer in the most diplomatic way he could."
It's their car. Well, 'their' means that it belongs to someone, like, "That ball is theirs" or "That is their house" rather than: "That ball belongs to that person" or "That person owns that house"...