一言為定既英文.....

1. A deal is a deal. deal 就係約定／協定，呢句就係叫人要遵守承諾。可以參考：http://education.atnext.com/index.cfm?fuseaction=Article.View&articleID=6302833&issueID=20060918
2. 我真的恨透我自己／我真係好憎自己。
3. pardon 其實係「原諒」之意，beg 係「乞求」；可見 I beg your pardon 其實（當然要配合適當o既 non-verbal language）係一句相當客氣o既說話。formal 場合可以作為聽唔清楚人地講野時要求重複之用。唔想咁，可以講：
Can you repeat, please? / Pardon? / Sorry? / Excuse me?

2007-07-31 23:48:08 補充：
A deal is a deal 唔一定係叫人守諾言，因為句野冇講明邊個，所以係可以用於所有涉及諾言o既人。

1> deal with it
2> 我真係好憎自己
3> 就係咁用

'you promised and you have to do it''
1.我好憎我自己
2.可以

一言為定,無得反口 - I PROMISE
really hate myself - 我真係憎我自己
'i beg your pardon'可在聽唔清楚人地講野時用, 可以SIMPLE D "PARDON", "PARDON ME"

Says it and mean it, does not have retracts something said 一言為定,無得反口
我真正地恨自己 'i really hate myself'
' 抱歉'i beg your pardon'