The bird covered the distance in three minutes.时态为?助动词 对cove

The bird covered the distance in three minutes.时态为?助动词 对covered the distance 划线提问
up to now的同义词组是?He has begun his own private'telephone' service.时态为?助动词 否定句 一般疑问句 肯否回答 对his own private'telephone' service划线提问
He has begun his own private'telephone' service.时态为？He has begun his own private'telephone' service的助动词He has begun his own private'telephone' service的 否定句He has begun his own private'telephone' service的 一般疑问句 He has begun his own private'telephone' service的肯否回答 对his own private'telephone' service划线提问

up to now 的同义词组为：so far ,till now ,untill now(这三个词组都是现在完成时的标志词,即他们出现时,句子常用现在完成时)
He has begun his own private'telephone' service.时态为现在完成时 ,助动词为has,否定句在Has 后加not,即 He hasn't begun his own private'telephone' service.一般疑问句：Has he begun his own private'telephone' service?肯定回答：Yes,he has.
另外,看您提的以上问题都是关于现在完成时的具体问题,以下建议您可能用得着：
1 现在完成时的句子结构为：have/has + 动词的过去分词,其中have/has为助动词.
2 一般的陈述句变一般疑问句时,常把助动词提到句首,再加上其他内容,句尾的句号变问号.肯定回答是：Yes,主语（常为人称代词,如you ,i ,he,she等）+助动词
还有什么问题,望追问.
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