02br 00= I had to do it (but the interlocutor 01u 00doesn't know if the speaker did tidy up his room or not02u 00) 02font 02br 02br 01font 00Don't try to use subjunctive. Say00 I 01i 00was02i 00 01b 00to tidy up02b 00 my room before my mother got back. 00Your interpretation is correct.
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01cite10Clive12cite11font10c) "Mary WAS TO HAVE cooked dinner / I was to have tidied up... / They were to stop off in Paris last night" = past expectation/obligation and the action 11u10was definitely not performed12u10.12font10 First two, yes. Last one, unclear, see A above