Can I use possessive with "number + noun", "noun + noun" and "adjective + noun"? 1 I guess this is one man's shirt. 2 I guess this is three boys' house. 3 I guess this is some boys' house. 4 I guess these are an ancient man's weapons. 5 I guess these are a big man's shirts. 6 I guess this is a giant mouse's tail.