work on/work at1、work on/work atwork on 与 work at 可通用，表示“忙于……”。但在 work on sth. 中，sth 是 work 的具体对象；而在 work at sth. 中，sth. 只说明所从事工作的性质，即时间、精力用在某一方面的事情上，而不在于说明正在做什么。如：He is working on/ at a novel. 他正在专心写一部小说。They have worked at this subject for many years. 他们从事这项课题的研究已经好多年了。Bob worked hard on organizing other singers to sing for him for free.鲍勃积极地组织其他歌唱家为他义务演唱。work out 算出；解决①Can you work out how much money it will need? 你能算出需多少钱吗？②I’ve worked out the problem. 我已解决了这个问题。2、take sides（in） 袒护；站在……一边①They took the side of their child. 他们袒护自己的孩子。②She has taken sides in the quarrel. 她参与了争吵。3、worth/worthy两者均是形容词，意思是“值得……的”，用法如下：（1）worthy 可以作定语，worth 不能。例如：a worthy rival 值得较量的对手（2）worth 后面直接跟名词（多为表示钱或代价的名词），其作用相当于介词；worthy 后面接名词时须与 of 连用（一般不接表示钱的名词）。例如：This second-hand book is worth 100 dollars. 这本旧书值 100 美元。His deed is worthy of praise. 他的事迹值得赞扬。（3）worth 后面可直接跟动名词的主动结构；worthy 后接动名词的被动结构，且须与 of 连用，worthy 后也可接不定式的被动式。例如：This book is worth reading.或：This book is worthy of being read.或：This book is worthy to be read. 这本书值得一读。The city is worth visiting.或：The city is worthy to be visited.或：The city is worthy of being visited.（4）表示 “很值得”，通常用 well 修饰，而不用 very。例如：The film is well worth seeing. 这部电影很值得一看。
