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Modal changes in indirect speech

Similarly to tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. changes, if the reported sentence is still true at the timeA concept which is related to our perception of reality; that part of existence which is measured in seconds, minutes, hours, days, weeks, etc. of reporting, no changes are made. If, however, the reported sentence is out of date, the following changes occur.

original utteranceSomething that somebody says in a specific context. reported sentence
can (present reference) could
can (future reference) would be able to
may (uncertainty) might
may (permission with present reference) was allowed to
may (permission with future reference) would be allowed to
will would
needn’t didn’t need to/didn’t have to
must (obligation) had to
must (certainty) must
could could
would would
might might
mustn’t mustn’t
had better had better
ought to ought to
should should
used to used to

Note that some modals (must (deduction), could, would, might, mustn't, had better, ought to, should, used to) do not change.

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Comments and questions

if we have this "i may have

if we have this "i may have to cancel the party" how could we change it

Changes are usually made to

Changes are usually made to the leftmost element, so "have to" remains, "may" is converted into "might".

He said he might have to cancel the meeting.

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