the book will be guide for teenages using the Internet.句中是for...答:3. 能用于it’s adj. for sb to do sth的形容词不多,主要的有bad, bold, clever, common, honest, necessary, nice, normal, pointless, rare, (all) right, rude, sensible, stupid, tactful, thoughtful, typical, unimportant, unusual, vital, wise, wrong等。但是请注意:likely和probable...