Clause

 

Clause

Sentence = subject = predicate. 
A sentence or a part of sentence   with its own subject and predicate .
1)     clause = 1)     subject + 1)     predicate
2)     clause = 2)     subject + 2)     predicate
3)     clause = 3)     subject + 3)     predicate
 For example: I am a boy.          I am a boy and she is a girl
                             clause                 clause              clause  
clause; main / principal (M .c)  independent in natural can stand on its own .
clause; subordinate (S. c) dependent in nature cannot stand on its own always dependent on the main clause . always gives information about . (M.C)    
Simple, 1 M.c
Only one main clause.
Example; aalia is a mother.
Compound, 2 M.c
Two more main clause joined by a coordinate conjunction.
Example; aalia is a mother but ahmed is a son.
Complex, 1 M.c + 1 S.c
At least one main clause joined with one or more sub-ordinate clause by sub-ordinating conjunction.
Example; aalia is a mother so ahmed is a son .         
Object:  answer what on verb .
Carries action of verb.
Always comes   after the main verb
Example, (1) I teach.  (2) I teach English .
Complement: mostly, it is the subject identifier .   
Never carries an action verb.
Always comes after helping verb.
Example;(1) you are a gamer. (2) ali is a nice boy .