It seems that passive forms of semi-modals verbs which ended in 'to' (like: used to, ought to, be able to, be going to, have (got) to) are not so common in everyday speech. Although some passive forms of these verbs may be more common than others (for example 'be going to'. I don't know). so what are the alternative passive forms or helping phrases (if exist) which could give a sense of passivization for these verbs
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What do you think passive forms of these would look like? Examples, please. Oh, and these are not "semi-modals"; need and dare are the English semimodals. These are periphrastic modals, meaning they consist of more than one word. They're essentially idioms and don't inflect much. – John Lawler May 21 '20 at 21:11
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for example "Languages were once taught at school by Mr Green." instead of "Languages used to be taught at this school by Mr Green. " – Houman May 21 '20 at 21:20
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Both of those are passive. – John Lawler May 21 '20 at 21:30
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@John Lawler. thanks. I edited the question – Houman May 21 '20 at 21:43