1.一般现在时
People grow rice in the south of the states.
Rice is grown in the south of the states.
The school doesn't allow us to enter the chemistry lab without a teacher.
We are not allowed to enter the chemistry lab without a teacher.
2.一般过去时
They agreed on the building of a new car factory last month.
The building of a new car factory was agreed on last month.
He had a strange way of making his classes lively and interesting.
And the students didn't forget his lessons easily.
He had a strange way of making his classes lively and his lessons were not easily forgotten.
3.一般将来时
They will send cars abroad by sea.
Cars will be sent abroad by sea.
They will give plenty of jobs to school-leavers.
Plenty of jobs will be given to school-leavers.
4.过去将来时
The manager said they would complete the project by the end of the year.
The manager said the project would be completed by the end of the year.
The workers told me they would mend the car as soon as possible.
The workers told me that the car would be mended as soon as possible.
5.现在进行时
The radio is broadcasting English lessons.
English lessons are being broadcasted on the radio.
——Have you moved into the new house?
——Not yet.We are painting the rooms.
The rooms are being painted.
6.过去进行时
——Why didn't they drive there on time?
——Because the workers were mending the road.
Because the road was being mended.
This time last year we were planting trees here.
Trees were being planted here this time last year.
7.现在完成时
Someone has told me the sports meet might be put off.
I have been told the sports meet might be put off.
We have brought down the price.
The price has been brought down.