be glad 是一个系表结构,表示为某事感到高兴,欢喜.其用法有3种：1.后带介词短语,如 I am glad about his new job.我为他的新工作感到高兴.2.后带动词不定式,如 I'll be glad to do you a favour.我愿意为你效劳.注意...