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9.5 动词的基本形式
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动词的基本形式包括:动词原形、第三人称单数形式、现在分词、过去式和过去分词形式。以下探讨动词的后四种形式。
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9.5.1 动词的第三人称单数形式
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在一般现在时中,当主语是第三人称单数时,动词应使用第三人称单数形式,具体的变化规则为:
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a 多数动词在词尾加-s。如:
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defeat 打败 → defeats fall 下降 → falls
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hope 希望 → hopes make 制作 → makes
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rise 上升 → rises run 奔跑 → runs
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succeed 成功 → succeeds walk 走路 → walks
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b 以o, s, x, ch, sh结尾的动词,在词尾加-es。如:
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do 做 → does echo 发出回声 → echoes
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go 去 → goes veto 否决 → vetoes
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dress 穿衣 → dresses express 表达 → expresses
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guess 猜测 → guesses kiss 吻 → kisses
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fix 固定 → fixes mix 混合 → mixes
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relax 放松 → relaxes tax 征税 → taxes
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reach 到达 → reaches search 搜寻 → searches
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teach 教会 → teaches touch 触摸 → touches
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finish 结束 → finishes punish 惩罚 → punishes
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wash 清洗 → washes wish 希望 → wishes
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c 以辅音字母+y结尾的动词,变y为i,再加-es。如:
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carry 携带 → carries deny 否认 → denies
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envy 妒忌 → envies reply 回答 → replies
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supply 供应 → supplies try 尝试 → tries
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vary 有差异 → varies worry 担心 → worries
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