2012年12月大学英语四级语法:不定式3! ]7 _- g1 n& T5 @2 G+ k- j
不定式的完成式 ) m7 H* | [- L: d# W; a; y9 _ 当不定式的动作发生在谓语动词的动作之前,不定式要用完成式,在句中可作宾语,状语以及构成复合宾语,复合谓语。, |% m6 `) e2 \! j( U4 D
She seemed to have heard about the news already。www.examw.com 5 b3 I6 @* I& ~. X, c) C: E; d& U He was believed to have been a very rich man。