一、连词+介词 While at college, Delia wrote a novel. 上大学时,迪莉娅写了一部小说。 Once in the examination hall, he forgot about all this. 一进考场,这一切他都忘了。 While in London, he studied the English labour movement. 在伦敦时他研究了英国的工人运动。 二、连词+形容词 He acted as if certain of success. 他表现得对成功很有把握似的。 If possible, let me know beforehand. 如果可能,可在事前通知我。