In episode 5 of the English sub of Sword Art Online: Alicization, Asuna infiltrates the Ocean Turtle facility disguised as Mayumi Reynolds.
When she arrives at the facility, she says "nice to meet you" to the guard who greets her in English. Further in, when another guard asks her to remove her sunglasses and confirm her identity, she replies "sure" in English.
Does Asuna have any significant English speaking ability? Or did she simply learn a few words in order to solidify her disguise?