Verb Tense Shift
You want to be sure that you are always consistent with your verb tense. When you shift verb tenses for no reason, and this is an easy mistake to make, you can really confuse your readers.
If you’re writing in the present tense, be sure you stay in the present tense. If you’re writing in the past tense, be sure you stay in the past tense. The exception would be if you need to shift tenses to tell a story, but that would be purposeful shifting. It’s the random, accidental shifting that causes the problems, as illustrated in this example:
Here is what a corrected version of the sentence looks like:
You should also be aware that certain types of writing require either past or present tense. For example, research in APA format often needs to be presented in the past tense, but a literary analysis written in MLA format needs to be presented using present tense verbs. It’s called the literary present tense.
If you’re ever unsure about tense requirements, be sure to ask your professor.