Sam has been swimming for fuor hours (改为否定句）

Sam has been skating for four hours.改为否定句 what does Sam collect?He___stamps A.collected B.is collecting C.has been collecting D.collects Next is Sam ,and he has been skating for four hours Sam has been swimming for fuor hours (改为否定句） how long has Alison been skateing?与how long did Sam skate的区别how long has Alison been skateing?与how long did Sam skate?的区别.简易点.复制的绕道. 1.The horse is so old and can't run _____it didA so faster as B so faster than C as fast as D as faster as2.They have never been there,____?A.were they?B has he C haven't they D have they3.I don't know if she ___this sunday.If she ___ I'll go swimmin has been MS SAM FILES HAVE NOT BEEN 帮我分析一下句子 1.What a bad day it has been for me.2.,Sam answered,afarid of looking up.分析一下语法与构成 Sam has his swimmming lesson on Tuesday and Saturday的音标是 Sam has his swi 25.My uncle,Sam,____ manager of the firm.（得分：1分） A) is just being made B) has just made C)25.My uncle,Sam,____ manager of the firm.（得分：1分） A) is just being made B) has just made C) is just made D) has just been made 为什么选d错My uncle,Sam,______ manager of the firm.A.has just made B.is just being made C.has just been made D.is just made Sam likes taking photos,and he ___(take) over 1000 photos.答案是has taken那么我填took 或 has been taking,这两个可不可以,区别又是什么呢,请大家帮我辨析下, has always has always been sam sam sam sam