定义：

表示正在进行的动作。

构成方式

1. 直接加+ing

2. 以不发音的e结尾，去e+ing

3. 以重读闭音节（辅音+元音+辅音）结尾的单词，双写末尾的辅音字母+ing

练习：

sing- ______ cut-________ dance-________ take-_______ make -________ use-_______ give-_______ run-_______watch-_______ open-_____ buy-_______ close-______

talk-_____ jump-______ help-_______ swim-_________

需要双写末尾辅音字母的单词总结：

一个m, 两个d和g, 三n，四p, 十个t

一个m: swim-swimming

两个d: nod-nodding rid-ridding

两个g: dig-digging beg-begging

三个n: run-running win-winning begin-beginning

四个p: shop-shopping drop-dropping

mop-mopping stop-stopping

十个t: sit-sitting hit-hitting fit-fitting set-setting

get-getting let-letting put-putting regret-regretting

forget-forgetting pat-patting

答案：

sing-singing cut-cutting dance-dancing

take-taking make-making use-using

give-giving run-running watch-watching

open-opening buy-buying close-closing

talk-talking jump-jumping help-helping

swim-swimming

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