請問the cab- horses are pitied so much as some others和the cab- horses are to be pitied so much as some others意思一樣嗎?加to be好像是多餘的?謝謝!?

passive adj sometimes not active; influenced by outside forces but not doing anything, suffering (from human to horses) without opposition.; expressing an action which is done to the subject(=horses) of a sentence.
In grammar the passive form of a verb  ie:-pitied---->to be pitied
Hence:-eg:-
The cab-horses are to be pitied (from human)