I'll have to beg off. I have another engagement.

恐怕我去不了了。我另有个约会。

Father told Tom to rake the soil level, but Tom tried to beg off.

父亲叫汤姆把土耙平，但汤姆设法求父亲别叫他干。

I'm afraid I am going to have to beg off from your dinner invitation.

我恐怕不得不请求原谅不能赴您的晚餐邀请了。

The night before the wedding, I decided to call my friends and beg off.

在婚礼前的晚上，我决定借故推辞我朋友的邀请。

Mother accepted an invitation to a dinner party, but a headache made her beg off.

母亲接受了赴宴的邀请，但因头痛不能出席而请求谅解。