Could someone explain the difference between depend and depends?
When do I need to add the "s" at the end?
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To answer your question, firstly we need to know about person and number. In the English language, person is classified into 3 types and number is classified into 2 types.
When the sentence is present tense and the subject is Third Person singular number, then the verb would be in plural form(depends).
Jake depends on green plants to live.
Jake's pets depend on green plants to live.