1.There was no need for you to have gone to all that trouble.
<-->You didn't........................
2.They say that Nam is the brightest student in our school.
<-->No........................................
3.We couldn't get nearer because of the police.
<-->The police......................
4.They have to rebuild many houses because of the earth-quake.
<-->Many houses.....................
1.There was no need for you to have gone to all that trouble.
<-->You needn't have gone to all that trouble
2.They say that Nam is the brightest student in our school.
<-->No one in our school is brighter than Nam
3.We couldn't get nearer because of the police.
<-->The police prevented us from getting nearer
4.They have to rebuild many houses because of the earth-quake.
<-->Many houses have to be rebuilt because of the earthquake
1.There was no need for you to have gone to all that trouble.
<-->You didn't..........necessary to have gone to all that trouble.....
2.They say that Nam is the brightest student in our school.
<-->No..............one in our school is brighter student than Nam.....
3.We couldn't get nearer because of the police.
<-->The police........prevented us from getting nearer.........
4.They have to rebuild many houses because of the earth-quake.
<-->Many houses....... have been had to rebuilt because of the earth-quake..............