1、一般情况下,直接在动词后加-ing (现在进行时)work ---- working study ----- studying
2、动词以不发音的-e结尾,要去-e加-ing take ----- taking make ----- making
3、重读闭音节的动词,要双写词尾字母,再加-ing cut ----- cutting put begin
4、以-ie结尾的动词,把变成y再加-ing lie ----- lying tie ----- tying die ----- dying