:
- , ( ), , :
They discussed the possibilities of cooperation
- , ( ), , ( ):
The possibilities of cooperation were discussed
C to be + Participle II. , , . . . , , , -, , . .
Indefinite, Continuous, Perfect.
Indefinite, to be Indefinite Participle II . , to be. (Participle II) :
This machine is made of plastic.
This machine was made of plastic
This machine will be made of plastic
. :
1) ( ) .
The letter was written.
.
The letter will be written.
.
- .
The letter is written.
.
2) -,
The fabric will be built here
.
3) - (3- ).
The letter was sent on Monday
. to be. to be . not , .
The letter is sent The letter is not sent
Is the letter sent? Will the letter be sent?
, , ( ) by, . , :
The project was changed by the manager
. ( ) :
The factory was built by new method.
(. .) .
was seen in office 3 hours ago.
(. .) 3 .
Continuous, to be Present Past Continuous Participle II , :
During the experiment the security in the laboratory was being provided by two infra red sensors.
.
Continuous:
