英语简单学第29课An unusual day

It is eight o'clock. The children go to school by car every day, but today, they are going to school on foot.
It is ten o'clock. Mrs Sawyer usually stays at home in the morning, but this morning, she is going to the shops.
It is four o’clock. In the afternoon, Mrs Sawyer usually drinks tea in the living-room, but this afternoon, she is drinking tea in the garden.
It is six o’clock. In the evening, the children usually do their homework, but this evening, they are not doing their homework. At the moment, they are playing in the garden.
It is nine o’clock, Mr. Sawyer usually reads his newspaper at night, but he is not reading his newspaper tonight. At the moment, he is reading an interesting book.

1. by car, 乘汽车。
   by（乘坐）表示"乘坐（某种交通工具）"，但它必须与动词连用。表交通工具的名词前不加冠词：

   • by boat 乘船
   • by bus 乘公共汽车
   • by plane 乘飞机
   • by sea 乘船

2. on foot, 步行。

3. 一般现在时与现在进行时
   一般现在时表示一般的动作或不断重复发生的动作；现在进行时表示说话时正在发生的动作，动作还没有完成。简单图示如下：
   一般现在时表示永久的情况；进行时表示暂时的情况。
   进行时只用于表示动作或偶尔发生的事件（We are eating, it is raining等等）。有些动词（如 like, want, know等）不是动作动词，因此不能用进行时态，如不能说 I am knowing或We are liking，而只能说 I know或 We like。
   一般现在时表达某个习惯性动作，通常与时间频度副词连用，如 usually, always, often, sometimes, never等；现在进行时表示此时此刻正在进行的动作，一般与 now, at the moment, today, this afternoon, this evening, tonight等连用。

   • We usually watch television at night. But we are listening to the stereo tonight.
     我们通常晚上看电视。但是今晚我们正在听立体声节目。