b1u2ⅱ.重点句型详解1．while walking the dog, you were careless and it got loose and was hit by a car.你在遛狗的时候不小心让狗松脱了，接着它被一辆小车撞着了。while walking the dog＝while you were walking the dog，这是状语从句的省略。在when, while, if, as if, though, as, where, unless等连词词组引导的状语从句中，如果谓语动词有be，而主语又跟主句的主语相同或为it时，则从句的主语和be常常省略。①when i was in japan, i took many beautiful pictures.在日本时，我拍了许多漂亮的照片。②while i was waiting, i read newspapers.我边等待，边看报纸。③if it were not for you, we would not go there.
