Directions: Read the sentences carefully. Identify if the sentence is Simple Sentence or Compound Sentence

1.Submarines travel underwater. (Simple Sentence or Compound Sentence)

2. To dive, the submarine is made heavier than the amount of water taken up by it.(simple sentence or compound sentence)

3. To rise, the submarine is made lighter (simple sentence or compound sentence)

4. In 1620, someone rowed a wood and leather submarine down the river Thames, but the first submarine was not built until the 1770s (simple sentence or compound sentence)