11.One function of a language can only be expressed by one structure.

12.A normal lesson should have the all the stages discussed in this unit and the stages should be in fixed order.

13.Usually a lesson should focus on practicing one single skill so that the students can develop that skill successfully.

14.The stages of a lesson overlap.

15.At each stage of the lesson,activities focus on all four skills.

16.Lesson plans are useful only before the lesson.

17.If the teacher uses the same techniques,some students may not have the chance to learn in the way that suits them best.

18.There is no one absolutely correct way to draw up a lesson plan and each teacher will decide what suits him or her best,but all good lesson plans give a clear picture of what the teacher intends to do in the lesson.

19.In order to keep students interested in learning English it is important to include a variety of activities and techniques in the lesson.

20.It is enough to introduce a range of different activities into a lesson to keep the students interested in learning English.