Es is present tense.
Será is future tense.
el niño es alto = the boy is tall.
el niño será alto = the boy will be tall.
2014年12月24日
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es = is
will be= será
you use "será" as future of "is" when something is not yet but in the future will be.
I hope you understand if you have other questons send me a menssage :)