語法知識：
(一)英語動詞4種時態(tài)：
1、一般現(xiàn)在時：常與表示程度或頻度的詞連用，如：often(經(jīng)常) , usually(通常，一般) , sometimes(有時) , always(總是，一直) , never(從不),表示經(jīng)常性或習(xí)慣性的動作,表示現(xiàn)在的特征或狀態(tài),表示普遍真理。
用動詞原形表示，第三人稱單數(shù)后，動詞要在詞尾加s(或es，或變y為i再加es)。如：I often get up at 7:00.
He often gets up at 7:30.
2、現(xiàn)在進行時：表示現(xiàn)在或現(xiàn)在這一階段正在進行的動作。用am / is / are 加 動詞ing形式表示，如:
What are you doing? I am reading a book.
What is he doing? He is singing.
3、一般將來時：常與表示將來的時間連用，如：tomorrow , next week , next year 等,表示將要發(fā)生的動作或情況。
用 am/ is/ are 加 going to形式表示，如：What are you going to do tomorrow? I’m going to ride a horse.
用will 加動詞原形表示，如：What will you do next Sunday? I will go shopping.
用am/ is/ are 加動詞ing 形式表示，如：What are you doing tomorrow? I’m going bowling.
4、一般過去時：經(jīng)常與表示過去的時間連用,如: yesterday, last night等, 表示過去某時發(fā)生的動作或情況。
動詞要用動詞的過去式。如：
Who was first? Ken was first.
Where were you yesterday? I was at home.
What did you do yesterday? I went to school.
