However , it is wise not to call them out of the blue just to ask for a favour .
然而在心情不好时打电话求助是不明智的。
You can ask him for a favour .
你可以请他帮个忙。
You 've only got to ask Ken for a favour and it 's no sooner said than done .
你只要得到肯的支持,这事就会说到做到。