E. 主语补足语

1. The man appeared to have been drinking. 这个男人好像是一直在喝酒。

2. I happened to have driven that kind of car before. 我碰巧从前开过这种车。

3. Between 1850 and 1910 the bison population is thought to have fallen from 60 million to just a few hundred. 人们认为，在1850年至1910年之间野牛的头数从6000万头降到只剩几百头了。

F. 形容词补足语

1. I am sorry to have kept you waiting so long. 真对不起,让你等了这么长时间。

2. We're glad to have invited you. 我们很高兴邀请了你。

3. I am sorry to have done that. 我对我做过的这件事表示遗憾。

(参见infinitive $^{15,16}$ )