1) She is beautiful. - Is she beautiful?2) The problem is easy to solve. - Is the problem easy to solve?3) You are richer than Mary. - Who is richer than Mary?4) Those people were rather young. - Were those people young?5) Your t-shirt is dirty. - Is your t-shirt dirty?6) Both of them are big. - Are both of them big?7) We are bad at tennis. - Are we bad at tennis?8) I was able to run fast then. - Was I able to run fast then?9) Her clothes are definitely expensive. - Are her clothes expensive?10) His room is clean. - Is his room clean?