Question

has+been+seen+后加动词的什么形式？

Answer 1

后面可以加上非谓语动词，后者充当主语补足语。如：has been seen to do sth, has been seen doing sth 或者 has been seen done 等等。

例：He has been seen playing soccer.

Answer 2

在句型"has been seen"后面加动词时，应该使用动词的过去分词形式。例如： "The movie has been seen by many people."（这部电影已经被很多人看过了。）其中，"seen"是"see"的过去分词形式。

Answer 3

您好，see 是常见的感官动词之一，跟其他的感官动词类似，我们可以说 see sb do 或 see sb doing sth，前者表示看着某人做完某事（如 see him walk into the house），而后者表示看见某人正在做某事（如 see him walking through the house），因此 has been seen 后面可以接动词不定式（从 see sb do 转来的），和现在分词（从 see sb doing 转过来的），例如：
He has been seen to walk into house.
He has been seen walking through the house.