run fast是什么意思

run fast是什么意思 run fast you run fast you run slow sadness is just follow是什么意思 Who can run fast? Itcan run fast. My brother ()(run)fast. H_ run wery fast. Run quickly enough和run fast enough The boy can run fast 对run fast 提问 She‘s trying to run fast.(对run fast提问) It can run fast.It run fast.哪个对 How fast the boy______(run)!