:表示现在正在进行或一段时间正在进行的动作标志词:now,look,listen等。:be+V--ing变化规则:1):play----playingwatch----watching以不发音的e结尾,:take----e---coming元+辅结尾,且是重读闭音节的单词,双写辅音字母+:run----runningswim----??Heissinging.---Isthewomanwriting?----No,sheisn’.----What’retheydoing?----They’reswimming.----Aretheyswimming?----Yes,theyare.---Aretheysinging?---No,theyaren’’.
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