How to do sentence Transformation for the following sentence

1. He sings a song
2. Farmers sow maize in the rainy season
3. They took all the necessary precautions
4. the workers dig a canal
5. The boy helps the cow
6. They speak Italian
7. He breaks the crystal vase
8. He repairs the fence

You have not mentioned how you want the sentence to be transformed. However I have transformed the sentences into simple past tense.

        1. He sings a song - He sang a song
         2. Farmers sow maize in the rainy season - The farmers sowed maize in the rainy season.
         3. They took all the necessary precautions - They had taken all the necessary precautions.
         4. The workers dig a canal - The workers dug a canal.
         5. The boy helps the cow - The boy helped the cow.
         6. They speak Italian - They spoke Italian.
         7. He breaks the crystal vase - He broke the crystal vase.
         8. He repairs the fence -  He repaired the fence.