例：A：Jenny often walks to school.

B：Jenny walked to school yesterday.

C：Jenny is going to walk to school tomorrow.

    On Christmas Eve, the evening before Christmas Day, children always put a stocking(长筒袜) at the end of their beds. Their parents often tell them that Santa will bring gifts for the good children. When the children sleep in their beds, Santa will climb down the chimney(烟囱)into the house and fill the stockings with Christmas gifts.

    In fact, children's fathers will put on red hats and red clothes. They will put the gifts into the stockings or under the Christmas trees.