Trees grow in forest.
Meaning: Trees can grow in a forest.
Choice of Words: Trees are tall plants with a trunk and branches. Grow is a verb that means to increase in size or develop. In is a preposition that means inside or within something. Forest is a large area of land covered with trees. When you put them together, "Trees grow in forest" means that trees increase in size or develop inside a large area of land covered with trees.
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Related Expressions