【用戶】Lisa Ting
【年級】國三上
【評論內容】S + V1. S+V2. The young man walked down the street. He whistled a merry tune.= S + V1 and V2. The young man walked down the street and whistled a merry tune.=S +V1(,) V2ing. The young man walked down the street(,) whistling a merry tune.= V1ing, S + V2.Walking down the street, the young man whistled a merry tune.