-> We were given a piece of sweet by the schoolboy
-> If they went home in time, they would have lunch 
-> The garden was being watered by Tommy at 7 p.m yesterday
-> If I learn how to dance beautifully, I will be able dance 
-> A two-day trip in Mekong Delta will be taken by the woman next year

The schoolboy gave us a piece of sweet
-> We were given a piece of sweet by the schoolboy
They  didn't have lunch because they couldn't go home in time
-> If they went home in time, they would have lunch 
Tommy was watering the garden at 7 p.m yesterday
-> The garden was being watered by Tommy at 7 p.m yesterday
I can dance because I learn how to dance beautifully
-> If I learn how to dance beautifully, I will be able to dance 
The woman will take a two- day trip in Mekong Delta next year
-> A two-day trip in Mekong Delta will be taken by the woman next year