改错。每句话都有一处错误，改正过来并把正确的句子写在横线上。
1. How many line make a triangle?
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2. Mr. Wood teach us English.
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3. There is five pencils in my pencil-box.
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4. It's a umbrella.
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5. Time to school.
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【考点】复数名词,不定冠词（a，an）,介词,一般现在时，动词单数第三人称,there be 句型

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