could not be 是過去式,所以說如果前面的句子是過去時(shí)的話,就要相應(yīng)地用could
而這二者相比較起來呢,could的語氣和程度相對(duì)會(huì)比can弱一些的哈
希望有什么問題可以再提出來的哈,我們繼續(xù)討論的哈!
In the absence of friction,belts could not be used in conveying power from one machine to another
In the absence of friction,belts could not be used in conveying power from one machine to another
這是一道選擇題,我想知道為什么不能用can not be,could not be 和can not be 有什么區(qū)別
這是一道選擇題,我想知道為什么不能用can not be,could not be 和can not be 有什么區(qū)別
英語人氣:820 ℃時(shí)間:2020-02-05 19:05:44
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