Английского

It (non-human): mountain, city, forest, cat, bee, etc. He (male human): man, father, husband, uncle, etc. She (female human): woman, lady, mother, girl, etc. He or she (common human): person, parent, child, cousin, etc.
Variable feature categories can be exemplified by the substantive number (singular — plural) or the degrees of comparison (positive — comparative — superlative).
Constant feature categories reflect the static classifications of phenomena, while variable feature categories expose various connections between phenomena. Some marginal categorial forms may acquire intermediary status, being located in-between the corresponding categorial poles. For instance, the nouns singularia tantum and pluralia tantum present a case of hybrid variable-constant formations, since their variable feature of number has become "rigid",
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or "lexicalised". Cf.: news, advice, progress; people, police; bellows, tongs; colours, letters; etc.
In distinction to these, the gender word-building pairs should be considered as a clear example of hybrid constant-variable formations, since their constant feature of gender has acquired some changeability properties, i.e. has become to a certain extent "grammaticalised". Cf.: actor — actress, author — authoress, lion — lioness, etc.
§ 6. In the light of the exposed characteristics of the categories, we may specify the status of grammatical paradigms of changeable forms.
Grammatical change has been interpreted in traditional terms of declension and conjugation. By declension the nominal change is implied (first of all, the case system), while by conjugation the verbal change is implied (the verbal forms of person, number, tense, etc.). However, the division of categories into immanent and reflective invites a division of forms on a somewhat more consistent basis.
Since the immanent feature is expressed by essentially independent grammatical forms, and the reflective feature, correspondingly, by essentially dependent grammatical forms, all the forms of the first order (immanent) should be classed as "declensional", while all the forms of the second order (reflective) should be classed as "conjugational".
In accord with this principle, the noun in such synthetical languages as Russian or Latin is declined by the forms of gender, number, and case, while the adjective is conjugated by the same forms. As for the English verb, it is conjugated by the reflective forms of person and number, but declined by the immanent forms of tense, aspect, voice, and mood.