Công thức bị động thì QKTD: S + was/ were+ ( not) + being + V (ed/ c3) + ( by S )...

thì TLĐ: S + will ( not) be + V (ed/ c3 ) + ( by S ) ...

1, a letter was being written to Peter's friend

2, some phone calls were being made by my friends

3, many acccidents were being caused by bad drivers

4, that report was being prepared by Alex when i came to see him

5, Was her mother being helped at that time?

6, customers were being served by waiters and waitresses

7, those papers were being signed by presidents at 8 o'clock yesterday

1, the meeting will be held brfore May Day

2, milk will be used to make yogurt

3, these excercises will be done tomorrow

4, my parcel will be posted 

5, those books won't be kept for reference

6, the library card will be issued soon