①首先 in the past 修饰的是use 这个动词
它在句中的成分是时间状语
②it is unbelievable that we use ‘displacement’、‘velocity’、‘speed’、‘acceleration’ //
是主语从句 ,it是形式主语 而真正的主语是we
主语从句的连接词是that
④to describe 动词不定式做非谓语
⑤the motion of objects不是宾语从句
英语句子成分求解In the past,it is unbelievable that we use ‘displace
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