Topic: Module 7 Unit 1 I helped Mum.Teaching aims: 1. Master new words such as: had, did, wash, cook, love, computer, him.版权所有 2. Master rules of changing a verb into its past form.3. Use past tense to describe what happened yesterday, such as: I Helped Mum. Sam watched TV. Amy phoned Grandma.21·cn·jy·comImportant points and difficulties: Rules of changing a verb into its past form and sentences of d..