How can I use passive voice to say this sentence with suggest? Is this grammatical:
These models are suggested to be phased out by us.
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Your suggestion is a little ambiguous; are you suggesting or phasing out? The best way of phrasing it in the passive voice is It is suggested that these models be phased out.
But the passive voice itself is rather weak; it conceals the identity of the suggester (which may, of course, be your intention). Unless there is an overriding reason, you should use the active voice, either as zooone9243 suggests or We suggest the phasing out of these models.
If you’re bound and determined to use suggest in a (doubly) passive construction, then I suppose that if you really wanted to, you could say
It is suggested that these models be phased out.
However, that’s pretty wordy, perhaps even overly formal, and perhaps even evasive. If it were me doing it, I’d just use this:
We suggest phasing these models out.
I find that that version sounds a lot simpler and more natural than anything else offered.
The subject in a passive clause must have the potential to become the object in an active clause. That would be the case in a sentence such as ‘These models were suggested to us by a close friend’. That can become active as ‘A close friend suggested these models to us’, but I can't quite see what the active vesion of your example would be. I'd avoid it, and use some of the other suggestions made here.