Could I ask you to be more accurate?
What do you mean by "what is structure"?
Every sentence has a syntax which influences the meaning of the sentence. Is this what you wanted to ask with your questions?
In English you have the following word order:
Subject Verb Object
In addition there are for example adverbs.
I would say you best should use google.com and type in "syntax english".
If there are any questions left which you would like to have anwsered do not hesitate to ask them.