'To be' may be omitted.
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Could you please tell me why we can omit ‘to be'?Well, 'want' here is one of a group of verbs (want, have, get, need, like, see, hear, watch, find, leave, etc) that take the form V + O + -ed participle clause): I want my car washed carefully; I found myself embarrassed by the incident. Most (all?) of these would be nonfinite clauses lacking 'to be'.