核心问题
×I am not possible to leave at once. (我不能马上离开。)有人说这个句子有毛病。但 possible 之后跟动词不定式不是很正常的吗？
词典解答
possible 之后跟动词不定式是正常的,但 possible 充当表语时,句子主语不能是表人的名词或代词,而必须是表物的名词或代词,或者是先行词 it:
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But is such a thing possible? (Wells) 但是这样的事情是可能的吗?
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Frost is possible in early summer. 初夏有可能下霜。
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It is entirely possible for us to fulfil the task ahead of schedule. 我们完全有可能提前完成任务。
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It is possible that they will be late. 他们可能会迟到。
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It was impossible to hear what he said. (Wood) 没有可能听到他说了什么。
因此，上面的错句应改为：It is not possible for me to leave at once.
(参见 impossible )