(1)只是，但是，可是(but)(infml)：I'd pay you～I don't have enongh money.我想偿还你，可是钱不够。The book is likely to be useful～it's rather expensive.这本书可能有用，不过相当贵。

(2)要不是(were it not for the fact that)(infml)：I would have gone，～you objected.要不是你反对，我早就走了。O～that he has a meeting，he would come to the party.若不是要开会，他会来参加聚会的。