主 +系 +形容词后能加 什么?后面的 做什么成分 如：the book is worth reading.readin

worth,worthy,worth-while都为adj。意为"值得"。1。worth：be worth + n。当名词为金钱时,表示"…… 值得……" be worth doing sth。"……某事值得被做" The question is not worth discussing again and again。2。worthy：be worthy of +n。当名词为抽象名词时表示"……值得……" be worthy to be done "某事值得被做" The question is not worthy to be discussed againand again。3。worth-while：be worth-while to do sth "值得做某事" worth while：It is worth while doing sth It is worth while sb to do sth。典型例题 It is not ____ to discuss the question again and again。A。worth B。worthy C。worth-while D。worth while 答案C。由worth的用法可知,此句只适合词组be worth-while to do sth。。因此选C。ps：至於reading做什么 我不太清楚,be worth doing 是一种固定搭配 再问： 后面的做什么成分啊？ 再答： sorry啊，不是我不想幫你，是我真的無能為力啊，我不知道后面的做什么成份，我幫你去看了一下語法書，但上面也沒說那個doing做什麽成份。