Fish swam by algae quickly.
Meaning: This sentence describes how the fish were moving in the water.
Choice of Words: Swam is a verb that means to move through water by using your fins or tail. By means near or next to something. Quickly means to move at a fast pace. When you put them together, "Fish swam by algae quickly" means that the fish were swimming near the algae and moving at a fast pace.
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