Present Simple -> Past Simple.
Present Perfect -> Past Perfect.
Present Continuous -> Past Continuous.
'Need' -> 'needed'.
'Ought to' does not backshift.
'Would' does not backshift.
'Will' -> 'would'.
Present Perfect Continuous -> Past Perfect Continuous.
Simple Past -> Past Perfect.
Present Continuous -> Past Continuous.
Present Perfect -> Past Perfect.
Simple Present -> Simple Past.
'May' -> 'might'.
Future Perfect Continuous -> 'would' form.
'Alas' requires 'exclaimed with sorrow'.
'Can' -> 'could'.
Present Perfect Continuous -> Past Perfect Continuous.
Negative imperative uses 'not to'. 'This' -> 'that'.
Subjunctive 'were' usually remains, pronoun 'I' -> 'she'.
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