Tang Wei was simply the most confident in expressing herself in English. Although she appeared fluent on the surface, her English was full of flaws. With a few more years of practice, she should be able to reach Jack Ma's level. Liu Yifei had the most standard grammar and her accent was okay, but it looked like she was reciting a script (which it probably was). The last one had the closest accent to native speaker level, but she also made many grammatical errors.