请问单词“chat"的doing形式是什么？

请问单词“chat"的doing形式是什么？

chatting
动词加ing变化形式只有三种，都弄明白吧：

1、大多动词直接在词尾加-ing，比如：go-going, work-working, study-studying, look-looking，do-doing,eat-eating,play-playing,read-reading,wash-washing,plant-planting,borrow-borrowing,pick-picking,paint-painting,cry-crying,took-tooking (v.拿，占领，接受） climb-climbing

2、有的以不发音的e字母结尾的动词，要去掉e再加-ing，比如：make-making, write-writing, skate-skating,close–closing, come-coming, make–making,take-taking，have-having,dance-dancing,
smile-smiling,ride-riding,become-becoming,
若结尾的e 发音,就不能去掉,如：see-seeing

3、以重读闭音节结尾，末尾只有一个辅音字母的动词，要双写这一辅音字母，再加-ing。例如：run-running, swim-swimming，get – getting,sit–sitting,put–putting,begin–beginning,hit-hitting
stop-stopping
如果结尾是元音字母加辅音字母组合,就直接加-ing。比如：drawing, playing

chatting

chatting

chatting