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如: I was dancing when singing. 2. 條件狀語從句: (1) 常由 if引導,從句可以放在主句之前也可以放于主句之后。 ( ) 1) My brother usually goes to school ______ his bike. A. by B. on C. in D. that ( ) 2) Helen is very ______. She hurt her head yesterday. A. care B. careful C. careless D. clever ( ) 3) We are ______ trouble. Could you help us? A. on B. with C. in D. for ( ) 4) I won’t go to the park if it ______ tomorrow. A. isn’t rain B. rains C. doesn’t rain D. raining ( ) 5) If we break the traffic lights, we may be in _____. A. dangerous B. danger C. safe D. safety 四、復習自測: 完形填空 In China, traffic keeps to the right. Cars, trucks, bu