There is no particular reason. To is never omitted after a passive finite verb; that's the way it is: I saw him walk yesterday. He was seen to walk yesterday.
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Goodman<<<He was seen to walk yesterday>>There isn't a single verb in English that can be followed by an infinitive in the active but requires a gerund in the passive.
I believe it should take a gerund, "walking" instead of the infinitve "to walk".
ZeroxGerund would suggest that someone saw a part of his walking and the walking is still happening, whereas the infinite suggests that someone saw the whole event and the walking is stopped now.I know that view has been expressed by quite a few grammarians. In my view they are just trying to make English more exact than it really is. If I see one o
Cool BreezeTo is never omitted after a passive finite verb; that's the way it is:Thank you for your comment. I should understand as is.