have been frightening
-he estado asustando
Present perfect progressive conjugation of frighten. There are other translations for this conjugation.

frighten

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That must have been frightening for her.
Debe haber sido aterrador para ella.
That must have been frightening.
Debe de haber sido aterrador.
Minami spent a moment mentally blessing her Yoritomo teachers; without them Manoru might have been frightening.
Minami estuvo un momento bendiciendo mentalmente a sus profesores Yoritomo; sin ellos Manoru podría parecer amenazador.
It must have been frightening and awesome, as she traveled to Judea to meditate on the Omnipotence she carried in a tiny chamber.
Debe haber sido asombroso y a la vez atemorizador el caminar a Judea meditando en la omnipotencia que llevaba en su diminuto santuario.
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