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日常练习中，大家经常会遇到单数句与复数句的转换。现在我们就来学一学如何在二者之间进行转换。 [操练] 按要求完成单数句与复数句的转换。 1. That is a rubber. (改为复数句) 2. These are apples. (改为单数句) 3. This is a photo. (改为复数句) 4. They are girls. (改为单数句) [秘诀] 将单数句变为复数句，通常要遵循的规则是：变、删、留。 [融会贯通] 变：将单数句中的指示代词、人称代词、物主代词、名词及动词变为对应的复数形式，如this→these, that→those, he / she / it→they, I→we, my→our, his / her / its→their, am / is →are, does→do等。 删：将单数句中的不定冠词a / an删掉。 如：That is a watch. → Those are watches. 留：保留单数句中的形容词、定冠词 the、副词、疑问词、介词等。如： This is a nice book.→These are nice books. What is that?→What are those? The boy in red is my cousin.→The boys in red are our cousins. He usually does his homework at home. →They usually do their homework at home. 要将复数句变为单数句时，逆向进行转换即可。 Key： 1. Those are rubbers. 2. This is an apple. 3. These are photos. 4. She is a girl. |
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