What is preposition phrase in the follow sentence: When you are seasick, you are not really sick from the sea.

A prepositional phrase begins with a preposition and ends with a noun or pronoun.

Here's a list of prepositions:

http://www.englishclub.com/grammar/prepositions-list.htm

What do you think the prepositional phrase is?

Is did you ever get seasick in a car a prepositional phrase

The preposition phrase in the given sentence is "from the sea."

To identify the preposition phrase in a sentence, you need to locate a preposition first. In this case, the preposition is "from." The preposition "from" shows the relationship between the word it governs (in this case, "sick") and another word in the sentence (in this case, "the sea").

The preposition phrase consists of the preposition "from" and the object of the preposition, which is "the sea." Together, they form the preposition phrase "from the sea."

In this sentence, the preposition phrase "from the sea" describes the cause or source of the sickness being discussed.