They are sad.
Meaning: This means that the group of people feel unhappiness or grief.
Choice of Words: They is the group of people being spoken about. Are is a form of the verb "to be" and indicates the state of being. Sad is an adjective describing a feeling of unhappiness or grief. When you put them together, "They are sad" means that the group of people being spoken about feel unhappiness or grief.
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Related Expressions