playing sports is the best way to keep healthy 为什么是to keep,又可以得到什么用法

Playing sports is good for us 这里为什么用playing Our P.E.teacher is playing sports.划线提问playing sports. is good for your health.A.play sports B.Play sports C.Playing sports D.Playing sport playing sports （is/are）good for our healthy. Exercise such as playing sports is fun 求翻译 Exercise such as playing sports is run,翻译, She thinks playing sports is relaxing.play为什么用不定式? playing sports is a good way to erescise什么意思 After school,he is very_______(activity)in playing sports. Exercise such as playing sports is fun中为什么要用playing而不是play? playing sports是什么意思? They're playing sports.问句 they like playing sports改错 playing sports for the first ( )Playing sports every day____good for our health. A.is B.are C.has D.have 请问这句英语句子对吗?My favorite sports is playing football.为什么? playing football is my favourite s------.是sports?用加s吗,为什么? Playing sports is good for everyone,especially for boys and girls.If you want...