be out doing sth

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肯定句用 need do

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at a convenient place and at the right cost在句中做什么成分，修饰那一句话？

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by having a quality product available

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need 后为何没有 to

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take into consideration

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数学上表示实数的R是哪个单词的缩写

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for to

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不定式是作状语还是宾语

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What I need

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主语一致

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when done

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虚拟语气，与将来事实不符

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as suddenly as

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have a much longer time/life to live

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it成分

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that much less

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w hen

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sorry to

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worrying that

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