34 David has cooked dinner for 30 minutes.
35 Mai asked Lan if she was going swimming in the summer.
36 Would you mind cleaning the floor? ( mind + Ving )
37 The project should be completed within a year.
38 I am under the impression that the work has already been finished.
39 Mai got up early yesterday so as to catch the first bus. ( so as to + V: để mà )
40 The manager had the report written by his seceretary last Tuesday
