13．Threeworkers（work） in our factory were praised by the leader yesterday．

分析 昨天我們工廠的三個(gè)工人受到領(lǐng)導(dǎo)的表揚(yáng)了．

解答 答案：workers．前面的three是基數(shù)詞三，后加上可數(shù)名詞復(fù)數(shù)，work是動(dòng)詞工作，結(jié)合句意是說三個(gè)工人受表揚(yáng)了，名詞是worker工人，復(fù)數(shù)workers，故答案是workers．

點(diǎn)評(píng) 加-er 變名詞的動(dòng)詞 
一、一般情況下在動(dòng)詞后面直接加er．
work---worker（工人） paint---painter（畫家） teach---teacher（教師） sing---singer（歌唱家） read---reader（讀者）  play---player（表演者）learn---learner（學(xué)者） 
二、以e結(jié)尾的動(dòng)詞直接加r．
dive---diver（跳水的人）dance---dancer（舞者）

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