【正文】
Self Check 1. sentences: the passive voice of past tense Eg. It was invented by a great man. 2. new words and phrases: crispy sour by mistake customer 。 Unit 6 When was it invented? Section B, 1a1e amp。 Self Check 一、 Teaching Aims: learn and to use new words crispy sour by mistake customer be able to use the passive voice of past tense 二 、 Teaching key points: (1) sentences: the passive voice of past tense Eg. It was invented by a great man. (2) new words and phrases: crispy sour by mistake customer 三、 Teaching difficult points: ★ sentences: the passive voice of past te