,孙老师，高中课后作业5中第四题动词的适当时态填空25题，The teacher____(write) an article recently and____(finish)it in a day or two答案第一空是has been writing,第二空是will finish我想问的是第二个空填will have finished 行吗？还有21题，when we got there,we found that they_____(left)ten minutes before.答案是had left 我记得您说如果句子中有明确的过去时间的话，就得用一般过去时，不能用现在完成时态，这句话中有明确的过去时间十分钟之前，是不是也不能用过去完成时态啊，您不是说每个态的特点都是一样的，只是在时间上进行前后推移吗？望您能尽快答复我！谢谢！

,孙老师，高中课后作业5中第四题动词的适当时态填空25题，The teacher____(write) an article recently and____(finish)it in a day or two答案第一空是has been writing,第二空是will finish取决于介词，如是by可用will have finished 还有21题，when we got there,we found that they_____(left)ten minutes before.答案是had left ten minutes before不是明确时间，明确过去时间是指last nightyesterday 1990....这里表示过去的过去。