Birds sweetly sing in the tall trees.

Meaning: This means that birds make pleasant sounds with their beaks while perched on the branches of tall trees. It's like saying, The birds are making beautiful music in the high trees.

Choice of Words: Birds are creatures that are known for their ability to fly and make sounds with their beaks. Sweetly is an adverb that modifies the verb "sing" and means that the sounds are pleasant and harmonious. Sing is a verb that describes the melodious sounds that birds produce. Tall is an adjective that describes the height of the trees. Trees are large plants with woody stems and branches that provide shelter and food for many animals.