First,Iwanttosay"thankyou"（双引号里面第一个字母最好用大写）for（to）you(andwishwantyouto)stillstaywithme. 　　Formerly,Ihadmanyfirendswhohad(去掉had)promiss(+ed)metokeepfirendshipforever. 　　ButIfind（注意时态,你总不能一直都发现这个吧）（加个that会好点）none（ofthem）staywithmewhenIgofartherandfarther.（整段都注意时态） 　　Now,Ijusthaveyou.SoIwanttothankyouagainandagain! 　　Youletmeknowwhatisfirend（youletmeknowaboutwhatfriendmeans）,whatisfirendship(whatfriendshipis/means). 　　Youletmeknow,tohaveagoodfirendandhavefirendshipareverybeaytiflytings. 　　Idon'tkonw,doesI'm(amI)afriendofqualifiedinyourheart? 　　ButI'msure(that)youareagoodfriend. 　　Ithink,agoodfirendcanhelpyoustudyandencourageeachothertomakeprogreesinstadebring(你不发现这里有两个谓语动词了么)trables. 　　Agoodfirendcanshareyourhappinessandsadniess（sadness）. 　　Themostimportant（用副词+ly）,agoodfirendwhoisalwaysbelieveyou.（不能成句,只有主语.你可以改成themostimpotantthingisthatagoodfriendalwaysbelievesyou） 　　Andheorshewilltryhisorher（their）besttounderstande（没有e）youinsteadfind（insteadoffinding）yourfault. 　　However,theseyouaredone(被动语态?你被做了?). 　　YouwillappeartocomfortmewhenI（am）sad;Youwilllaugh（smile）withmewhenI（am）happy.You（have）stuy（ied）withmealreadyhave（去掉）fouryears. 　　althoughI'mnotthequalitiesofagoodfirend,I'lltrymybesttodoitwell!Untillikeyoutreatme. 　　Ihope,ourfour-year（形容词）firendshipcancntinuethenext（morethan）fouryearsandfouryears. 　　Myprivilegetohaveyou!(拥有了你?) 　　Dear,Don'tleaveme.BcauseWithoutyouraccompany,Iwalkreallylonely. 　　Bestwish! 　　说实话,初二水平……不过感情真挚!（冒昧问一下,你初几?） 　　加油吧! 　　辛苦你了,也累坏我了~