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d 动词be和have的第三人称单数形式分别为is和has。
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9.5.2 动词的现在分词形式
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a 一般情况下,在动词词尾直接加-ing。如:
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build 建立 → building earn 赚钱 → earning
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grow 成长 → growing repeat 重复 → repeating
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speak 说话 → speaking start 开始 → starting
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train 训练 → training work 工作 → working
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b 以不发音的e结尾的动词,去掉e,再加-ing。如:
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achieve 取得 → achieving change 改变 → changing
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continue 继续 → continuing leave 离开 → leaving
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move 移动 → moving organize 组织 → organizing
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prepare 准备 →preparing reduce 减少 → reducing
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c 单音节,且以元音字母+辅音字母结尾的动词,要双写最后的辅音字母,再加-ing。 如:
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drop 掉落 → dropping get 得到 → getting
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plan 计划 → planning run 奔跑 → running
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set 确定 → setting sit 坐下 → sitting
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stir 搅动 → stirring swim 游泳 → swimming
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但以x结尾的动词除外,如:
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fix 安装 → fixing mix 混合 → mixing
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d 重音在最后一个音节,且结尾是辅音字母的动词,要双写最后的辅音字母,再加-ing。 如:
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begin 开始 → beginning compel 强迫 → compelling
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forget 忘记 → forgetting occur 发生 → occurring
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omit 遗漏 → omitting refer 提到 → referring
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regret 懊悔 → regretting transfer 转移 → transferring
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但以x结尾的动词除外。如:
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