PLease CLRIFY BE+PAST PARTICIPLE IN GRAMMER WITH EXAMPLE?

Answer 1

be + past participle -------passive voice of the verb (the subject is not the doer of the action)

The party would be postponed.
Sugar would be added.
Complete your form or else it would be rejected.
We will be carried away.

there's also be +present participle (the subject is the doer, and the verb is in progressive form):

I will be writing everything on the board.
Robert would be singing on stage.

there's also be+adjective (the subject is described):

I would be afraid.
It would be impossible for me to do that.

Answer 2

Some more examples.

a. ACTIVE VOICE
I want to give him an example.

b. PASSIVE VOICE
I want to be given an example by him.

a. Mum bought this book.
b.This book was bought by mum.

a.Tom scored the winning goal.
b. The winning goal was scored by Tom.

Now remember that for regular verbs (where the Simple Past form ends with 'ed'), the Past Participle also ends with 'ed'.

a. Cliff played the leading role.
b. The leading role was played by Cliff.

a. The teacher solved this difficult problem.
b. This difficult problemwas solved by the teacher.

You might want to know the difference between, and the purpose of TWO voices in grammar.

It depends where the speaker or writer wants to put the emphasis,
according to the particular situation.

Look at the last example. The active voice is used because the speaker wants the emphasis on 'the teacher', ie It was the teacher and nobody else.
The passive voice is used because the speaker wants to emphasise 'this problem'. ie it was this problem and not the others.

I hope this helps you.