不定式完成被动式 “to have been helped with her work”表示过去被动，相当于that she has been helped with her work

　　2)我们再以不及物动词 seem，appear, happen为例进行分析

　　●It seems that Sharon is a brave girl.

　　= Sharon seems to be a brave girl.

　　莎朗似乎是个勇敢的女孩。

　　seem 是不及物动词，that引导的从句担当主语，it是形式主语。当句子以简单句形式出现时，从句的主语担当主语，seem, appear, happen后面的非谓语动词只允许使用动词不定式的各种形式担当表语, 而不可以使用动名词。

　　●It happened that Harrison was sleeping in the room.

　　= Harrison happened to be sleeping in the room.

　　碰巧当时哈里森正在屋里睡觉。

　　不定式to be sleeping担当不及物动词happened的表语，源自was sleeping。

　　* 不可以说：Harrison happened ╳sleeping in the room.

　　不及物动词happened不可以跟动名词sleeping担当表语。

　　(未完待续)

　　一般式 to do to be done

　　进行式 to be doing

　　完成式 to have done to have been done

　　完成进行式 to have been doing

　　动词不定式 主动 (4种) 被动 (2种)

　　现在分词 主动 (2种) 被动 (2种)

　　一般式 doing being done

　　完成式 having done having been done

　　过去分词(1种) done

　　动名词 主动 (2种) 被动(2种)

　　一般式 doing being done

　　完成式 having done having been done

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