四、用括号内所给单词的适当形式填空。
1. It's four thirty in the afternoon now.
Classes
(class) are over.
2. Will you come and join
us
(our)?
3. The
libraries
(library) in our school are very big.
4. I like these
magazines
(magazine).
5. I'll
play
(play) ball games. Will you join me?
6. Is Nancy
watching
(watch) a cartoon now?
7. They want
to buy
(buy) things for the Chinese New Year.
8. They
go
(go)
skating
(skate) on Saturdays.
答案：1. Classes 2. us 3. libraries 4. magazines 5. play 6. watching 7. to buy 8. go, skating
解析：
【解析】
1. 句中be动词为are，主语需用复数形式，class的复数是Classes，句首单词首字母大写，故填Classes。
2. join是及物动词，后接人称代词宾格作宾语，our的宾格形式是us，故填us。
3. be动词为are，主语要用复数，library的复数形式是libraries，故填libraries。
4. these（这些）后接可数名词复数，magazine的复数是magazines，故填magazines。
5. will是一般将来时的助动词，后接动词原形，故填play。
6. 根据now和句首的Is，可知本句为现在进行时，结构为“be+动词现在分词”，watch的现在分词是watching，故填watching。
7. want后接动词不定式作宾语，构成固定搭配want to do sth.（想要做某事），故填to buy。
8. 根据on Saturdays可知本句为一般现在时，主语they是复数，谓语动词用原形go；go skating是固定短语（去滑冰），故填go, skating。
【答案】
1. Classes 2. us 3. libraries 4. magazines 5. play 6. watching 7. to buy 8. go, skating
【知识点】
名词复数变形、代词宾格运用、动词时态与非谓语
【点评】
本题考查小学英语基础语法知识，涵盖名词复数、代词宾格、动词时态及固定搭配等考点，注重对基础语法点的综合运用，有助于学生巩固核心语法知识。
【难度系数】
0.7
