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I have known it happen▼[UK: ˈaɪ həv nəʊn ɪt ˈhæ.pən] [US: ˈaɪ həv ˈnoʊn ˈɪt ˈhæ.pən]
I have known it to happen▼[UK: ˈaɪ həv nəʊn ɪt tuː ˈhæ.pən] [US: ˈaɪ həv ˈnoʊn ˈɪt ˈtuː ˈhæ.pən]
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