许多语法书上都说 however 不能位于句首。是否如此？
however 位于句首比位于句中的情况要少得多,但是位于句首并不被认为是一种错误。请看下面一些实例：
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You can phone the doctor if you like. However, I very much doubt whether you will get him to come out on a Saturday night. (CGEL) 如果你愿意的话，可以给大夫打个电话。可是我怀疑你是否能让他星期六晚上出来。
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However, they did not seem to have much effect. (Wilde) 然而, 这好像不起什么作用。
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However, I can discuss this all when I see you. (Yeats) 可是等我们见面时, 我可以和你商量所有这一切的。
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However, this does not always happen. (New Concept English, Book 2, L. 16) 然而, 这样的情况是不常有的。
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However, a few days later, he was told that a mistake had been made. (New Concept English, Book 2, L. 72) 然而，几天以后，有人告诉他有差错。
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However, as the evidence began to accumulate, experts from the Zoo felt obliged to investigate, for the descriptions given by people who claimed to have seen the puma were extraordinarily similar. (New Concept English, Book 3, L.1) 然而，当证据越来越多时，伦敦动物园的专家们感到不得不进行调查，因为那些声称看见过美洲狮的人对它的描绘极其相似。