what are you doing中doing放在疑问词后为什么不是动词原形do,疑问词后面的动词不是都要用原形吗?

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• what are you doing中doing放在疑问词后为什么不是动词原形do,疑问词后面的动词不是都要用原形吗?
• what are you doing中doing放在疑问词后为什么不是动词原形do,疑问词后面的动词不是都要用原形吗?
• 1、Jim,you look worried.What's wrong with you?为毛worry要用过去式?2、You'd better find a pen pal if you don't get much writing practice.don't后面不是加动词原形吗,为什么write用现在分词形式,还有为什么练习又是原型.顺便 you'd的’d的是什么意思哦!3、It's important for us to learn English well.为什么要用for做连词后面为什么又要用动词不定式4、She doesn't have a pen to write with为什么又要动词不定式而后面还要加上with5、I don't have a partner to practice English with.为毛又要加with6、疑问词+to do sth 小弟膜拜中…………………………全副身家奉上………………再感叹一句，英语超级难学！
• Did you finish doing your homework中do为什么加ing,did后不是加动词原形吗
• Did you finish doing your homework中do为什么加ing,did后不是加动词原形吗
• what is always going butnever gets anywhere?
• -------sunny weather 填what 或 how 我填的是how ,错了,可是书上说how后接形容词sunny不是形容词吗.what后接名词,可sunny 是名词吗、