Reported verbs go back one tensee.g. Present Perfect - Past PerfectI've finished my homework. - She said she had finished her homework.NB. Pronouns also change where necessary - 'I've' - 'She said she had ...'Present Continuous - Past ContinuousI'm going to Jenny's house.She said she had finished her homework, so she was going to Jenny's house.Some modal verbs change: 'will' - 'would':I won't be late back. - She said she wouldn't be late.Also:'can' - 'could''may' - 'might''mus't - 'had to'Other modals don't change!'should' - 'should''might' - 'might'