Heoftenhaslunch,Andhehastofinishtheworkin2hours,Adoeshe,doesheBdoesn'the,doesn'thechasn'the,hasn'theDhashe,hashe如果可以帮忙讲解下现在完成时的用法有些不懂

　　Heoftenhaslunch,Andhehastofinishtheworkin2hours,Adoeshe,doeshe

　　Bdoesn'the,doesn'the

　　chasn'the,hasn'the

　　Dhashe,hashe

　　如果可以帮忙讲解下现在完成时的用法有些不懂