使用時機
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例句
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中文解釋
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1、命令句;祈使句
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Open the window, please.
Feed the dog, please.
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請開窗。
請餵狗。
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2、前面有助動詞時
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He didn't open the window.
She couldn't feed the dog.
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他沒有開窗。
她不能餵狗。
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3、不定詞的後面
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He asked me to open the window.
It is impossible for her to feed the dog.
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他叫我開窗。
要她餵狗是不可能的。
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4、使役動詞+受詞+原v
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He made me open the window.
I let her feed the dog.
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他強迫我開窗。
我准她去餵狗。
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5、表現習慣性動作
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I always open the window as soon as I walk into the room.
I usually feed the dog good food.
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我總是一進房就開窗。
我通常餵狗好食物。
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比較:主詞是第三人稱時字尾加s或es
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He always opens the window as soon as he walks into the room.
She feeds the dog three times a day.
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他總是一進房就開窗。
她一天餵狗三次。
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註:第5是「現在式」用法,而動詞不加s或es時,才叫原形動詞。
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