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I always have some problems with changing an active sentence which contains used to into a passive sentence, for example:

Mr Green used to teach languages at school.

What is the passive form? Is it

Languages were used to be taught at school.

or is it

Languages used to be taught at school.

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The correct passive sentence on a formal English test would be neither of yours. It would be this:

Languages used to be taught at school by Mr Green.

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Really? That's stupid. 90% of natural passives are agentless. One of the big reasons to use the passive is because the agent is unknown or irrelevant. – John Lawler Apr 30 '13 at 13:34
JL is requiring an answer to 'What is the usual passive form associated with ...' whereas BF is requiring an answer to 'What is a semantically very close passive recast of ...'. – Edwin Ashworth Apr 30 '13 at 15:18
Plus, I suspect, we agree that we have no reason whatever to cooperate with such a silly and counterproductive system. I'm certainly not here to improve anyone's curriculum; I think curricula are evil. – John Lawler Apr 30 '13 at 18:41
@JohnL: Yes, we agree on that, too. My goal was to teach EFL students how to actually use the language so they could clearly express themselves & be easily understood. I created all my own materials based on what my students needed, avoided useless forays into the grammar-book jungle, & gave no written tests. – user21497 Apr 30 '13 at 23:36
Pretty much my own experience when I taught ESL for 6 years, during and after my MA studies. This taught me how little I knew about English syntax; when I went back to get my PhD I made sure I concentrated on that. ESL and Native students are all blinkered by ridiculous grammar books, test, and teachers. But they're different for ESL and Native learners. – John Lawler May 1 '13 at 0:31

You could begin by replacing the "used to" by "once" or "formerly" so your active sentence (past tense) becomes

Mr Green once taught languages at school.

The passive form will then be

Languages were once taught at school by Mr Green.

Note it would be more usual to be more specific about where the languages were taught (since languages now forms the focus of the sentence.

Languages were once taught at this school by Mr Green.

If you really want to retain the "used to" form, then you can replace "were once" with "used to be" giving

Languages used to be taught at this school by Mr Green.

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