Grammar Point:In Chinese grammar, 替 tì and 代替 dàitì are prepositions used to indicate substitution or acting on behalf of someone or something. Structure Noun/Pronoun + 替 tì + Noun/Pronoun + V The nouns and pronouns here usually are human not objects. 他tā替tì我wǒ做zuò了le很hěn多duō工作gōngzuò他tā替tì我wǒ做zuò了le很hěn多duō工作gōngzuòHe did a lot of work for me. (substitution) 我wǒ替tì老闆lǎobǎn接jiē了le電話diànhuà我wǒ替tì老板lǎobǎn接jiē了le电话diànhuàI answered the phone…