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