http://www.studyspanish.com/lessons/serest1.htm

http://spanish.about.com/od/usingparticularverbs/a/ser.htm

In English, the verb "to be" can be used to tell how something is (the condition) and what something is (the essence).

ser (to be)
soy
eres
es
somos
sois
son





estar (to be)
estoy
estás
está
estamos
estáis
están

Grader Ser and Estar: Part I [Quiz #1]

The following questions were not answered or were answered incorrectly.
Please go back to correct the errors and re-submit.

Question Hint
2.   HINT: "Boring" is a characteristic. (Answers the question: "What is he like?")  
6.   HINT: What are they like? They are tiresome.  
10.   HINT: The boys are big for their age - condition.  
13.   HINT: The expression "ser vivo" means "to be a lively person."  
15.   HINT: What type of a person is my sister? My sister is very quiet.  
17.   HINT: How is the apple? The apple is unripe - condition.  
18.   You did NOT answer this question.  

He is boring.= He is a boring man.
He is bored.= He feels bored now.

https://www.youtube.com/watch?v=BFmmvdANZl0&list=TLyKZW1_Ypqn1cQmj7OTLXJSmFjdTPahR7

I am => Soy
I am from => Soy de

Sth is made of sth => xxx es de xxx