Tenses of the participle. Past participle
Since participles are verb forms, they have tense meaning. The suffix -gan (-kan, -qan) expresses a feature of past action: ko‘rgan odam (a person who has seen), gullagan o‘lka (a blossomed land). Spelling rules: after a vowel -gan is added (o‘qigan, yashagan). After a voiceless consonant it may sound like -kan but is written -gan (ko‘chgan, o‘sgan). After q we write -qan (tiq — tiqqan) and after k we write -kan (tik — tikkan). After g‘ it may sound like -qan but is written -gan (tug‘ — tug‘gan).
“Which is written?”: the teacher says “ko‘ch+kan?”; children write the correct spelling (ko‘chgan) on the board and state the rule.