The meaning of -you ni naru ～ようになる – 意味 ‘-you ni naru’ shows a change in the status. So it means, ‘to come to the point that..’ ‘to start to.. (as a habit)’ (with dictionary form) ‘to become able to’ (with potential form)  It also means ‘to turn out..’ (with ない-form with +くなる sentence ), be …