Blue fish swim deep ocean.

Meaning: A fish that is blue in color is swimming very deep in the ocean.

Choice of Words: Blue is a color. Fish is an animal that lives in water and has fins. Swim means to move through water using fins or other body parts. Deep means far down from the surface. Ocean is a very large body of salt water.

Alternative Expressions

The blue fish swims in the deep ocean.

Meaning: This sentence is also describing a blue fish that is swimming deep down in the ocean, but it is more specific because it uses the determiner "the" to indicate that we are talking about a particular fish.

Choice of Words: The is a determiner that specifies that we are talking about a particular fish. Blue describes the color of the fish. Fish is a noun that refers to a living creature that lives in water and has gills and fins. Swims is a verb that means to move through water by using your fins or tail. In is a preposition that indicates that the fish is located within the ocean. Deep describes how far down the fish is swimming in the ocean. Ocean is a noun that refers to a large body of salt water that covers most of the Earth's surface.

A blue fish is swimming in the depths of the ocean.

Meaning: This sentence is similar to the previous two sentences, but it uses the indefinite article "a" to indicate that we are talking about any fish, and it uses the noun "depths" to indicate that the fish is swimming in the deepest part of the ocean.

Choice of Words: A is an indefinite article that indicates that we are talking about any fish. Blue describes the color of the fish. Fish is a noun that refers to a living creature that lives in water and has gills and fins. Is swimming is a verb phrase that indicates that the fish is currently moving through water. In is a preposition that indicates that the fish is located within the ocean. Depths is a noun that refers to the deepest part of the ocean. Ocean is a noun that refers to a large body of salt water that covers most of the Earth's surface.

Related Expressions