They went to the store to buy food.
Meaning: This sentence means that someone went to a place where goods are sold in order to buy food.
Choice of Words: Went means to move from one place to another. Store is a place where goods are sold. Buy means to get something by paying money for it. Food is something that people eat to get energy and nutrients. When you combine them, "went to the store to buy food" means that someone moved from one place to another where goods are sold in order to get something that people eat to get energy and nutrients by paying money for it.
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Related Expressions