He has just come back.现在完成时.He has just come back.为什么不是用came?has/have+动词过去式?

He has just come back.现在完成时.He has just come back.为什么不是用came?has/have+动词过去式? My grandfather_____.He is still very tireds.a.has just come back b.has already come back c. have yet come backd.have just come back he has just come out a book为什么是错的 He has just come back form a southern city 为什么用a he has just come here .No one knows ( ) 为什么用 where he is from 而不用 where he was from James has just arrived ,but I did not konw he ___ until yesterday.a.will come b.was coming c.has come d.comes He's just come home.这里的‘s是has还是is啊?如果是has那么come不就应该是came了吗? 求翻not once in that time has anyone come to my class just because he or she wanted to mr ford has just arrived,but i didn't know he [ ]until yesterdaya will come b was coming c comes d had come. James has just arrived,but I didn't know he ____ until yesterday.A.will come 8.was comingC.had come D.came Tom has just arrived,but I didn't know he ___ until yesterday.(come)时态填空.答案是would come,请问为什么 一道反义疑问句的题He can't have come here,has he?He can't have come here just now,did he?为什么这两句话后面不同? he has just left there 意思 To my s________,he has come back. Has he come back?对么?不用came? jack has just come back to england!缩写句子 怎么回答 who has just come back from india? （）is it that has just come in