beg to be excused

1. I beg to be excused from your nephew's wedding.
    我请求不去参加你侄子的婚礼。

2. I beg to be excused from the party.
    我请求同意我不参加宴会。

beg to be excused的解释

3. I beg to be excused from your nephews wedding.
    我请求不去参加你侄子的婚礼。