Period 4 GrammarTeaching Aims: 1. Help Ss to get a clear understanding about the different usages of prepositions of time(aton”in).2. Do related exercises and check whether Ss can handle with the prepositions of time.Teaching focus:1. Help Ss to get a clear understanding about the different usages of prepositions of time(aton”in).2. Do related exercises and check whether Ss can handle with the prepositions of time.Teaching difficulties:Help Ss to get a clear understanding about the different usages of prepositions of time(aton”in).Teaching procedures:Step 1 ReviewReview the words about the seven days in a week, four seasons in a year and the twelve months in a year.Step 2 Practice 1.Complete an e-mail about Halloween using the prepositions of time (at/ on/ in).2.Ask Ss to make up sentences using the three prepositions of time and write down the typical sentences on the blackboard.3.Ask Ss to discuss with each other and generate the usages of the three prepositions of time according to the sentences on the blackboard. 4.Ask Ss to sum up the usages of the three prepositions. If Ss still cannot tell out all the usages, just give a help to do some supplements.5.Do related exercises and check the answers with multimedia. If Ss makes mistakes just help him/her to get the correct answer.6.Give Ss several minutes to complete the exercise on page 45&46 in the textbook and check. Step 3 Speak upAsk Ss to work in groups and talk about their school days using the prepositions of time. Ask them to do a report or to act out the dialogue in front of the whole class. Let other Ss to find out the prepositions of time the speakers used.Step 4 Homework Complete Period Five 教后记： 1