dear ms.xxx，
i would like to know if i could ask for a casual leave of absence from your oral english class this wednesday morning.
yesterday evening i got a phone call from my cousin, who is now running a small firm in suburbs of this city . he needs an interpreter for two days but cannot find the most reliable person， so he wants me to have a try. personally ， i regard this as a golden opportunity to put what i have learned in your class into practice， but i need your permission of absence . if you think i may go and help him get over the difficulty， i am confident that i ll do a good job and both of us will grateful.
earnestly yours，
xxx
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