She (notice) this mistake if she had been more attentive. - I might have gone on an excursion with you if I (know) about it beforehand. - If we (know) that you were there, we would have called on you. - If I had known of his arrival, I (meet) him. - Nobody told me about your trouble. I would have helped you if I (know) about it. - If you had tried your best, you (get) the job. - If he (not work) late, he would have caught his bus. - If Mary had agreed to sit in for us, we (go) to the movie yesterday. - He (pass) his exams well if he had studied hard. - I would have prepared everything yesterday if I (receive) your message on Monday.