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In Biblical Hebrew, nouns are classified according to gender, either masculine, feminine, or sometimes both. Grammatical modifiers (such as adjectives, active and passive participles, pronouns, pronominal suffixes) change their endings in order to agree with the gender of the term they refer to. A finite verb with masculine gender indicates a masculine subject. All references to male persons in Biblical Hebrew are masculine. However, other entities apart from people can also be classified as maculine. For example, the proper names of nations and tribes are often masculine in Biblical Hebrew. Some particles are also marked for gender in Biblical Hebrew.
Note
Some nouns appear to be masculine but are actually feminine, even some common nouns such as אֵם (mother) and אֶרֶץ (earth). These nouns are feminine even though they do NOT take feminine endings. A dictionary or lexicon will indicate the proper gender for each word.