般情况下,直接在动词原形后面加 -ing.going asking finding working being seeing printing raining standing studying speaking spelling 以不发音的-e 结尾的动词,去-e ,再加-ing.coming taking firing encircling writing becoming breathing leaving 闭音节的单音节词,或以重读闭音节结尾的多音节词,这些词的末尾只有一个辅音字母时,双写这个辅音字母,再加 -ing.sitting running getting cutting stopping beginning planning permitting