Don’t walk so fast.请问这里的fast 是什么词性呢?

Don’t walk so fast.请问这里的fast 是什么词性呢? 同义句转换：You don't need to walk so fast同义句There's ___ ___ for you ____ walk so fast. so. please don't walk amay是什么意思? 是don't run so fast 还是no running so fast? i'm so tired .i can't walk so fast 合并一为句 He don't walk fast enough to catch the early bus.的同义句 I'm tired .I can't walk so fast(合并为一句） 你没必要别走那么快 用英语说（填空）You don't______ ______ walk so fast Because I don't like fast food so let's eat at home.那里错了? You are r___ hungry today.Don’t eat so fast,please横线上应填什么 Don't know why people become so fast .Friends do not cross the dog the old man is so old .he can't walk fast合为一句the old man is ____old____walk fast. （英语）Don‘t let the child run so fast.He is too young,----------Don’t let the child run so fast.He is too young,___________.A.all after B.after all C.either D.although请选择并说明理由, Don't U Walk Away please don t walk awayk Please don’t drive----It’s too dangerous.you see there are so many cars and bikes A this fast b as fast c such fast d fast like that Key:a D为什么错啊? Don't ride too fast ,it s____ Don't run fast ____________meals.(填单词