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