The Passive form

1- Its form:
Be  + -ed (past participle)

The form is built by a conjugation of the auxiliary verb (BE).  
The main verb is the past participle.
In the active voice, the object receives the action of the verb.
In the passive voice, the subject receives the action of the verb:
The object of the active verb becomes the subject of the passive verb.
Only transitive verbs are used in the passive.
The progressive forms of the present perfect, 
past perfect, future, and future perfect are not 
used in the passive.

2- Examples:

 Infinitive
To be reached 
  

 Simple  

Present 
It is reached 
 Past 
It was reached 
 Future 
It will be reached 
Conditional 
It would be reached 
 
 Continuous

  Present 
It is being reached 
  Past
It was being reached 
  Future   
It will be being reached 
  Conditional  
It would be being reached 

  Perfect simple

 Present
It has been reached 
 Past   
It had been reached 
 Future    
It will have been   reached 
 Conditional  
It would have been reached 

 Perfect continuous

 Present
It has been being reached 
 Past   
It had been being reached 
 Future  
It will have been being reached 
 Conditional
It would have been being reached 

We use the passive when:
                 We want to make the active object more important 
                 We do not know the active subject.

They are known. 
They were born in Caracas.

The passive verb is followed with a “by phrase” only if it is important
to know who perform an action. Usually, The “ by phrase” is not used. 
The passive is most frequently used when it is not known or not 
important to know exactly who performs an action.

3- Stative passive:
 We use the past participle as an adjective:

The pen is broken.
“Broken” functions as an adjective.

Some idiomatic expressions use the passive form. 
These sentences have no equivalent active sentences.
It is gone
He is exhausted
She is lost

4- The passive and adjectives with: GET 
Get may be followed by certain adjectives. In this case 
get = become.
Examples:
Get
Angry, anxious, bald, big, busy, chilly, cold dark, empty, fat, full, good, 
heavy, hot, hungry, late, light, mad, nervous, old, rich, sick, sleepy, tall, 
thirsty, warm, well, wet.

They got rich.

Get may also be followed by a past participle, which 
functions as an adjective and describes the subject.

She is getting married this week.
 
5- Used to and Be used to:
"Used to" expresses a habit, activity or situation that existed 
in the past but which no longer exists. (Not anymore)

She used to write items.

Be used to and be accustomed to are followed by a 
gerund or by a noun object.

They are used to (accustomed to) speaking very quickly.
He is used to (accustomed to) cold weather.

Be used to = be accustomed to = usual and normal 
= not strange.

Get used to and get accustomed to give the same 
meaning. In this case get means become

He got used to hot weather.

 
6- Participial adjectives:

- ING (active meaning) 
-ED (passive meaning)
She bored her friends. 
Her friends were bored. (By her)
She was a boring girl. 
They are bored friends.