Do是个非常常用的词,在中学英语课本里大量出现,且有多种用法,下面就其主要用法进行归纳.一、用作助动词.1.But the family didmanage to send him to a technical school…(SBⅡP.92)不过家里的人还是设法送他进了一所技术学校……2.Do be careful!一定要当心!二、替代动词及动词词组,以避免重复.1.A feather falls slower than a stone onlybecause the air holds the feather back more thanit does the stone.(SBⅠP.45) Do is a very commonly used word, appearing in English textbooks in high school, and has a variety of usages. The following summarizes its main usages. First, it is used as auxiliary verb. 1.But the family didmanage to send him to a technical school...( SBIIP.92) But the family still managed to send him into a technical school... 2. Do be careful! Be careful! 2. Replace verbs and verb phrases to avoid repetition. 1.A feather falls slower than a Stone onlybecause the air holds the feather back more thanit does the stone.(SBIP.45)