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CaseSingularPlural
Nominativeименительный · кто? что?иностранец иностранцы the subject: who or what acts
Accusativeвинительный · кого? что?иностранца иностранцев the direct object of the verb
Genitiveродительный · кого? чего?иностранца иностранцев possession, absence, "of"-phrases
Dativeдательный · кому? чему?иностранцу иностранцам the receiver: to or for someone
Instrumentalтворительный · кем? чем?иностранцем иностранцами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?иностранце иностранцах location and topics: in, at, about

Иностранец is animate, so its accusative copies the genitive: the form after "I see..." matches the form after "of".

Look up any other word in the Russian declension tool, see where иностранец ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

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Slova drills иностранец and every word like it with typed case endings, checked letter by letter.

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