Unit 1 Welcome back to school
例1：用所给动词的适当时态填空。
　　1. Look! The boys _______(play) football over there. They _______(play) football every Saturday afternoon.
　　2. I_______(do) my homework now. I often ______(do) my homework in the evening.
　　3. My mother ______(drive) her car very well. She _____（drive) her car to work every day. She ______(drive)her car home now.
　　4. Tom ______(like) watching TV. He _______(watch) TV every evening. But now he _______(not watch) TV. He ______(read) a story-book.
　　5.--Listen! Who ______(sing) in the next room?
　　　--Er, it’s Kate. She ______(sing) in her room every day. She _______(sing) very well.

答案：1.are playing, play 2.am doing, do 3.drives, drives, is driving 4.likes, watches, isn’t watching, is reading 5.is singing, sings, sings

说明：一般现在时用来表示经常的或习惯性的动作或状态；而现在进行时表示现在（说话的瞬间）正在进行的动作。