The bird covered the distance in three minutes.时态为?助动词 对covered the distance 划线提问
问题描述：
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
答
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...