It runs by so fast句中by是什么意思呢,此句与It run so fast的意思是一样的嘛

A kangaroo runs so fast that it an catch up with a train同义句 he can not runs fast.此句run要否加s so fast (does he run) he runs为什么只能用括号里的 英文求教Nancy doesn’t run fast 肯定句是 Nancy runs fast 这个 Nancy can It runs fast. My car is so slow that it makes a bicycle look fast by(compa can you run fast?意思的下句 Tom did`t run so fast as Jim.改为肯定句 Tom ran＿ fast it can't run fast.(变成同义句） so fast 的 fast 是形容词还是副词 Ben runs fast.I run faster.合并一句 A kangaroo runs so fast that it can catch up with a train