If I start an essay in past tense, can I change it to present tense later in the same essay or not?

For example: (past tense) Morir: murio, murieron Dormir: Durmio, durmieron I understand that they stem change in the past te...

"Insects would devour all our crops ,if it WERE NOT for the protection we get from insect-eating animals." Thanks xoxox

It's a descriptive essay about lasertagging(my youth group went there) and I don't know how to start it because it's not supp...

i don't know how to start off a research paper. i know what i'm going to write but i hate that i don't know how to start it o...

I have to write about me being trapped on a island and the first paragraph has to be about the settings and my situation as i...

Essay due tommorow. Needs to be 5 paragraphs. About how we have needed help from others to achieve a goal..

Any feed back woule be great Topic is an obstacle we have faced in our life Growing up, I have faced many personal obstacles...

I am writing the Reveiw of litature for my science fair project. How do I start of the essay good, How do I write the paper?...

Maths question How do you change cm into ml???

if any one doesnt mind reading this...it would be great Growing up, I have faced many personal obstacles in my life. One tha...