This change of time nearly always results in a change of tense. When a past-tense reporting verb is used, the tense of what was said originally usually moves one tense back into the past.

Readers are familiar with this tense because they are used to being told a story that has already taken place. For most verbs you add an 'ed' at the end of the word to change it to the past tense ...

For example, the tense may change between the methods section and the discussion section. The abstract is usually in the past tense due to it showing what has already been studied. Example: “This ...

For most verbs you add an ‘ed’ at the end of the word to change it to the past tense - for example, ‘she talks’ becomes ‘she talked’. However, there are some irregular verbs where the ...