1. Underline the correct option. (Sublinhe a opção correta)
a) I - be/am/ is twelve years old. b) They - be/am/ are in the garden. c) It - am/is/are six o'clock. d) You - be/is/are a dentist. e) I - am/is/are in the station. f) It - am/is/are very hot. g) My sister - am/is/are at work. h) I-be/am/ are hungry. i) We - am/is/are students. j) The book -be/is/are about tigers.