只能說be going to ride bike,不能說be going riding bike,這樣累贅,如果一定要說be going riding bike,此時(shí)外國人會(huì)省略going,直接說 be riding bike,riding bikes中的riding 是動(dòng)詞.bikes是名詞.通常用于進(jìn)行時(shí),比如We are riding bikes.【我們正在騎車】
. 而 be going bike riding其實(shí)也可以寫成be going bike-riding,后面可以看成一個(gè)詞,bike-riding 是復(fù)合名詞,就是兩個(gè)名詞連接在一起構(gòu)成的復(fù)合詞,字面意思,就是名詞.如We are doing bike-riding.【我們正在騎車】.
因?yàn)轵T馬會(huì)說成horse riding,騎自行車也就會(huì)說成bike riding
口語中經(jīng)常會(huì)這樣說,這是習(xí)慣用法.
如：I went bike riding in the park yesterday.我昨天去公園騎車了.
口語中很多不一定按照嚴(yán)格的語法來,bike riding是習(xí)慣口語說法.