3 sentences

1. 这只是个赝品。

   zhè zhǐ shì gè yàn​pǐn.

   It's just a fake.

   Source: OpenSubtitles

2. 这幅画经鉴定后被证实是赝品。

   zhè fú huà jīng jiàn​dìng hòu bèi zhèng​shí shì yàn​pǐn.

   The painting was confirmed to be a forgery after appraisal.

   Source: Dong Chinese Dictionary

3. 为了避免买到赝品，专家建议大家多学习如何鉴别书画真伪。

   wèi​le bì​miǎn mǎi​dào yàn​pǐn, zhuān​jiā jiàn​yì dà​jiā duō xué​xí rú​hé jiàn​bié shū​huà zhēn​wěi.

   To avoid buying fakes, experts suggest that everyone learn more about how to authenticate calligraphy and paintings.

   Source: Dong Chinese Dictionary