Do i have any errors on my essay? my teacher don't want us to use the words- is,am,are,was,were,be,being,th…

In the 3rd paragraph you say : "while war exist" its supposed to be while war existS. then you say "witch transforms.." its WHICH transforms. then you say "That are soilders" you said that you couldn't say "ARE" you also say "be" somewhere and more... have someone on your family check it..