stand →standing do →doing clean →cleaning 二、动词以单一的不发音的e字母结尾时,去e再加-ing。如:
skate →skating dance →dancing make →making have →having write →writing come →coming 三、以重读闭音节结尾的动词,如末尾只有一个辅音字母,则先双写该辅音字母,再加-ing。如:run →running put →putting swim →swimming sit →sitting