please solve this...
Answers
Answer:
The Egyptians were the first to build the dam among the ancient civilization. This was simple enough to make of rocks and gravel which resisted the force of water. However, the dam was not very effective as water eventually managed to trickle through the rocks. The Mesopotamians on the other hand, built their dam, of soil and clay.
The Romans built the first concrete dam in 100 BCE, but in the 17th century the Spanish perfected the art of building dams. They travelled around the world, to take their building methods with them and to share the knowledge with the rest of the world.
➸ To write these perfectly, one must perfect his knowledge about verbs and it's different forms.
➸ One must also know about different rules of tenses.
➸ Verb is an action word.
➸ Tense indicates the time period in which the action had been done.
➸ In simple words it tells whether something happened in past, is happening in present or will happen in future.