课文详注 Further notes on the text
1．by car, 乘汽车。
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。
语法 Grammar in use
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.
词汇学习 Word study
The children are playing in the garden.
Let's play chess!
He likes playing basketball.
All work and no play makes Jack a dull boy.
She cooked a lovely meal for her husband.
The beef is not cooked enough.
Tom works as a cook in a local restaurant.
My dad is really a good cook.
练习答案 Key to written exercises
1 She usually drinks tea in the morning, but this morning, she is drinking coffee.
2 They usually play in the garden in the afternoon, but this afternoon, they are playing in the park.
3 He usually washes the dishes at night, but tonight he is washing clothes.
1 What does she usually do in the morning?
She usually drinks tea in the morning.
What is she doing this morning?
She is drinking coffee.
2 What do they usually do in the afternoon?
They usually play in the garden in the afternoon.
What are they doing this afternoon?
They are swimming in the river.
3 What do you usually do in the evening?
I usually cook a meal in the evening.
What are you doing this evening?
I am reading a book this evening.