帮忙找找这篇英语短文中的错误!MarkTwain,likeyouknow,wasfamousinhisdaysasthepublicspeaker.Healwayslikedtoplayjokeonhisfriends.Oneday,theoneofhisfriendslosttheirwalletandaskedhimtobuyatrainticketforh

　　帮忙找找这篇英语短文中的错误!

　　MarkTwain,likeyouknow,wasfamousinhisdaysasthepublicspeaker.Healwayslikedtoplayjokeonhisfriends.Oneday,theoneofhisfriendslosttheirwalletandaskedhimtobuyatrainticketforhim."ButIdoonthaveenoughmoneytopaybothyourticketandmine,"MarkTwainsaid.Thefrienddidnotknowwhattodo."Letusdothis,"MarkTwainsaying,"Youcangetoffthetrainandwhentheconductorcomestochecktheticketyoucanhideundermyseat."Later,however,whentheconductorcomestochecktheticket,MarkTwaingavehimtwotickets---oneforhimandtheotherforhisfriend.