2, Unless you give me your address, I can’t send you a postcard.
3, If he had been careful, he would not have lost his savings.
4, Were he not so lazy, he would be more successful.
5, Had you finished your work, you would have been awarded.
6, If you don’t tell him what to do, Bill never does anything.
II
1, People use silk to make these artificial flowers.
2, He has made no mistakes in his composition.
3, We must wash this dress in cold water.
4, They built this house 100 years ago.
5, The students are writing the lessons now.
