老师：Hello, boys and girls. Nice to meet you. Welcome to my class. I'm Miss John from Nanjing Zhong Yi Middle School. Today we are going to learn Unit 4, growing up, grammar. You know what? I felt a little nervous before I had a class here. After I stood here, I felt much better. While or when having classes. You should listen carefully. I have been crazy about basketball since I was a little girl. As soon as the rain stopped, I went out to play basketball. I played basketball until or till it was time for lunch. I watch the NBA whenever there is a game on the internet.
老师：Look at the red words. Before, after, while, when, since, as soon as, until, till, whenever. What is the part of speech of these words? Verbs, at verbs or conjunctions? Yes, there are conjunctions. We use these conjunctions to introduce time classes. These are adverbial clauses of time. They can be placed at the beginning or in the middle of the sentences. When they placed at the beginning of the sentence, we use a comma here.
老师：I am a basketball lover. Our friend David is also a basketball lover. But when David was a little kid, he was really naughty. Let's watch a video and see what he did.
老师：No, David, no, no. Come back here, David. Don't play with your food. That's enough. David, put your toys away. Not in the house, David, kid. David is really a troublemaker. David was playing baseball when he broke the west. Here a play is a durable verb and Brock is a non durable verb. We can also say while or when David was playing baseball he broke the west.
老师：Don't forget the comma here. David's mom was doing the dishes while David was playing baseball. Here do and play are both durable verbs. Let's fill in the blanks with when a while. He was walking in the street when his mom asked him to come back, he dirty to the floor while or when he was walking in the room while or when he was having a bad, he wetted the floor. Here he was can be dropped. Let's see one of Kid Davies days.
老师：1. I played with my toy car every morning before I brushed my teeth. I brushed my teeth after I played with my toy car every morning. 2. After I played with my toy car for hours, I felt bored. Before means earlier than a certain time. After means later than a certain time. 3. I saw a lovely dog while or when I was riding my bike in the park. When I saw a lovely dog, I was riding my bike in the park.
老师：4. I was bathroom when I heard someone knock on the door. While or when I was bathering, I heard someone knock on the door. 5. I was ready to sleep when my mom came to read stories for me. When miss at or during a certain time. While means during a certain time. Teenager David is writing in his diary about one of his days. Help him combine his sentences using before, after, when, a while. 1. I go
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