I couldn't hear you clearly.这里的could是can的过去式吗?还是作助动词,表示允许、许可

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I couldn't hear you clearly.这里的could是can的过去式吗?还是作助动词,表示允许、许可]能,可以?
I couldn't hear you clearly.这里的could只是can能的过去式吗?
还是作助动词,表示允许、许可]能,可以?还是[用于婉转语气、有礼貌地提议,比用can 更具婉转含义]

嗯,表委婉这里
再问： I couldn't hear you clearly.请问这句句子是过去时，还是现在时也能用呢？
再答：现在也可以啊
再问：当现在时用时，不用把could not换成can not吗？直接还是用couldn't ？could是can的过去时呀。
再答：都说了委婉呀妹妹
再问：哥哥呀，你怎么看出这句的couldn't 不是过去式的用法呢？I couldn't hear you clearly.我也可以说它就是CAN‘t的过去时呀。
再答：两种解释都行。如果他只是刚刚听不到，那就是委婉，如果他是说过去的一件事，就是过去但过去没听到的话，说i didn't hear u就行啦，一般不用那个呀，

I couldn't hear you clearly.这里的could是can的过去式吗?还是作助动词,表示允许、许可 Could you sing __(loud)?I can't hear you clearly.填loudier和lo I'm sorry I can't hear you clearly.please read it a_____.这里填 ann ,could you ____the tv a bat i can't hear that clearly.A couldn't是can't的过去式吗 I can't hear clearly,can you read the news aloud还是用slowly pardon?I can't hear you clearly翻译 Please raise your _____.I can't hear you clearly. I really can't hear you clearly with the radio ( ) She spoke clearly,so that every could hear.这里hear是动词还是名词? She spoke clearly ,so that wvery could hear.hear在这里是名词还是动词?s I am sorry I couldn't hear you clearly.Please r____ your qus