Ss will think of at least two advantages and two disadvantages of working in teams. Ss check the answers in pairs. Ss share their answers with the class.

T tells the Ss to do ex.1 and ex.2 in handout1 together. T tells Ss not to worry if they can't answer. T monitors. T shows the answers and asks Ss how many ones they got right? which ones they didn't get it right or get it at all.

T elicits function and meaning of modal perfect using the examples in Handout 1. T uses discrimination sentences to clarify the meaning of may/could/might v.s must and needn't have and didn't need to. T asks concept checking questions. T elicit the form from Ss by showing them the marker sentence "The meeting may/should/could/must have finished" and then asking them to help her with the form of positive and negative statements. T says the marker sentence and draws the Ss' attention of the weak forms of 've, modal verbs and pronunciation of t in must have/can't have/ might have T drills.

T asks Ss to do ex. B P.78 alone. T asks Ss to check the answers in pairs. T opens class feedback.

T divides Ss into pairs ( A-B). T demonstrate with the Ss. T asks Ss to create be creative with the reasons. T starts the task. T monitors and takes notes. T asks Ss to change roles. T monitors and takes notes. T invites Ss to act their roles in public. T give feedback.