Who runs fast?为什么run加s

Who runs fast?为什么run加s He runs fast.为什么run后面要加s啊 Who runs as fast as Tom ______?A.does B.run C.do D.did Who can run fast? ( ) 5.Jack _____ Tom.A.not runs so fast as B.runs not fast as C.doesn’t run as faster as D.doesn’t run so fast as 能否请您告诉我为什么以及翻译呢,麻烦啦 国家前介词加of还是for?who runs fastest in your class?为什么用runs不用run? Ben runs fast.I run faster.合并一句 为什莫He runs fast.run 后面加 s . he can not runs fast.此句run要否加s jim run fast .tom runs farst er 合并为一句话 Tom runs very quickly ,but he does' run very fast .peter runs very slowly ,but he runs veiy fast. 英文求教Nancy doesn’t run fast 肯定句是 Nancy runs fast 这个 Nancy can run fast 有这样一个题目：jim ______ as fast as than me.空格要填run 但是填runs还是run啊！为什么啊 合并成一句Tom runs fast.Jack runs faster than Tom.改为Tom does _ run _ fast as Jack. John runs very fast.Peter runs fast.(句意不变)John ____ run as ____ as Peter. 1.Lily can ____ very fast.A.run B.runs C.to run D.running the brown horse can ____1___very fast.look it's____2____with a dog a.run running b.runs,runningc.run,run her sister is a ____（run）；she runs very fast