模仿范例，给下列句子进行分类。
A. The students are watching the play.
B. He forgot the movements at first.
C. It was time for the play.
D. They saw a new poster at school.
E. Bobby is singing again.
F. She is really happy now.
A. The students are watching the play.
B. He forgot the movements at first.
C. It was time for the play.
D. They saw a new poster at school.
E. Bobby is singing again.
F. She is really happy now.
答案：The present：A、E、F；The past：B、C、D
解析：
本题要求将句子按照时态分为现在时（The present）和过去时（The past）两类：
1. 归为The present的句子都属于现在相关时态，谓语动词用现在形式：A是现在进行时，用了are watching；E是现在进行时，用了is singing；F用了be动词的现在时形式is，还有时间提示now，都符合现在时的特征。
2. 归为The past的句子都属于过去时态，谓语动词用过去式：B中forgot是forget的过去式，C中was是am/is的过去式，D中saw是see的过去式，都符合过去时的特征。
1. 归为The present的句子都属于现在相关时态，谓语动词用现在形式：A是现在进行时，用了are watching；E是现在进行时，用了is singing；F用了be动词的现在时形式is，还有时间提示now，都符合现在时的特征。
2. 归为The past的句子都属于过去时态，谓语动词用过去式：B中forgot是forget的过去式，C中was是am/is的过去式，D中saw是see的过去式，都符合过去时的特征。
1. 从括号中选择合适的选项，将序号填在横线上。
(1) Last week, Sam (A. sees B. saw) the poster in the park.
(2) They were afraid but they (A. tried B. try) to calm down.
(3) I want to (A. danced B. dance) again next year.
(4) He (A. is practising B. practised) a lot last week.
(5) I really (A. enjoying B. enjoyed) the trip.
(6) I started to do exercise (A. last Sunday B. next Sunday).
(1) Last week, Sam (A. sees B. saw) the poster in the park.
(2) They were afraid but they (A. tried B. try) to calm down.
(3) I want to (A. danced B. dance) again next year.
(4) He (A. is practising B. practised) a lot last week.
(5) I really (A. enjoying B. enjoyed) the trip.
(6) I started to do exercise (A. last Sunday B. next Sunday).
答案：(1) B (2) A (3) B (4) B (5) B (6) A
解析：
我们结合时态规则和固定搭配逐一判断：
(1) 句中"Last week"（上周）是一般过去时的时间标志，谓语动词要使用过去式，see的过去式是saw，选B。
(2) 前半句的be动词were是过去式，说明句子整体为一般过去时，并列分句的动词也要用过去式，try的过去式是tried，选A。
(3) 固定搭配"want to do sth." 意为“想要做某事”，to后面要接动词原形，选B。
(4) 句中"last week"（上周）是一般过去时的时间标志，谓语动词要用过去式practised，选B。
(5) 句子缺少谓语动词，A选项enjoying是现在分词，不能单独作谓语，使用动词过去式enjoyed作谓语符合语法规则，选B。
(6) 句中动词started是start的过去式，说明句子是一般过去时，要搭配表示过去的时间状语，last Sunday是过去的时间，next Sunday是将来的时间，选A。
(1) 句中"Last week"（上周）是一般过去时的时间标志，谓语动词要使用过去式，see的过去式是saw，选B。
(2) 前半句的be动词were是过去式，说明句子整体为一般过去时，并列分句的动词也要用过去式，try的过去式是tried，选A。
(3) 固定搭配"want to do sth." 意为“想要做某事”，to后面要接动词原形，选B。
(4) 句中"last week"（上周）是一般过去时的时间标志，谓语动词要用过去式practised，选B。
(5) 句子缺少谓语动词，A选项enjoying是现在分词，不能单独作谓语，使用动词过去式enjoyed作谓语符合语法规则，选B。
(6) 句中动词started是start的过去式，说明句子是一般过去时，要搭配表示过去的时间状语，last Sunday是过去的时间，next Sunday是将来的时间，选A。
2. 选择填空。
()(1) Last Sunday, my mother and I a play.
A. watches B. watch C. watched
()(2) Five days ago, Li Ming ill.
A. is B. was C. were
()(3) I to bring the book yesterday.
A. forget B. forgot C. forgets
()(4) Long ago, there a lot of different animals here.
A. were B. was C. are
()(5) She some birds in the forest last summer.
A. sees B. saw C. see
()(1) Last Sunday, my mother and I a play.
A. watches B. watch C. watched
()(2) Five days ago, Li Ming ill.
A. is B. was C. were
()(3) I to bring the book yesterday.
A. forget B. forgot C. forgets
()(4) Long ago, there a lot of different animals here.
A. were B. was C. are
()(5) She some birds in the forest last summer.
A. sees B. saw C. see
答案：(1)C (2)B (3)B (4)A (5)B
解析：
这几道题均考查一般过去时的用法，句中给出的过去时间状语（Last Sunday、Five days ago、yesterday、Long ago、last summer）都提示句子要使用一般过去时，动词需要使用对应的过去式：
1. 第(1)题：时间是上周日，watch的过去式是watched，对应选项C。
2. 第(2)题：时间是五天前，主语Li Ming是第三人称单数，be动词的单数过去式为was，对应选项B。
3. 第(3)题：时间是昨天，forget的过去式是forgot，对应选项B。
4. 第(4)题：时间是很久以前，there be句型后接复数名词animals，对应的be动词过去式复数形式是were，对应选项A。
5. 第(5)题：时间是去年夏天，see的过去式是saw，对应选项B。
1. 第(1)题：时间是上周日，watch的过去式是watched，对应选项C。
2. 第(2)题：时间是五天前，主语Li Ming是第三人称单数，be动词的单数过去式为was，对应选项B。
3. 第(3)题：时间是昨天，forget的过去式是forgot，对应选项B。
4. 第(4)题：时间是很久以前，there be句型后接复数名词animals，对应的be动词过去式复数形式是were，对应选项A。
5. 第(5)题：时间是去年夏天，see的过去式是saw，对应选项B。