http://chinesexpert.com/%e7%9d%80%e4%ba%86-%e0%b9%81%e0%b8%a5%e0%b8%b0-%e8%bf%87-%e0%b8%95%e0%b8%b1%e0%b8%a7%e0%b8%8a%e0%b9%88%e0%b8%a7%e0%b8%a2%e0%b8%9a%e0%b8%ad%e0%b8%81-tense-%e0%b9%83%e0%b8%99%e0%b8%a0%e0%b8%b2%e0%b8%a9%e0%b8%b2%e0%b8%88%e0%b8%b5%e0%b8%99/?filter_by=popular
着,了 และ 过 ตัวช่วยบอก Tense ในภาษาจีน