In formal writing, it is important to keep verb tenses consistent so that readers can follow the progress of ideas and arguments easily. It is important to use verb tenses consistently throughout a paper, carefully signaling any necessary shifts in tense.
Simple Present: They walk to the store.
Present Perfect: They have walked to the store.
Simple Past: They walked to the store yesterday.
Past Perfect: They had walked by noon.
Future: They will walk to the store.
Future Perfect: They will have walked to the store by the end of the day.
Sometimes in academic writing, it is necessary to signal to the reader that one event was completed in the past before another past event occurred. Use the perfect form (have + verb) in these instances.
When discussing a specific essay or piece of literature, use the present tense throughout the paper.
Please Note: The writer should choose the specific tense to be used in the essay and then coordinate all other verbs with it to reflect future and past events in relation to the chosen tense.