He had already demonstrated fluency in Giants history by quoting chapter and verse on games gone by.
And Prince Dracula soon demonstrated fluency in the tongue of Ivan the Terrible, though Holmes told me there was much that was old-fashioned, even archaic, in Dracula's speech.
Foreigners must usually demonstrate fluency in it to obtain citizenship.
In fact, in order to be able to matriculate at UFU one must demonstrate fluency in Ukrainian.
As a hyperpolyglot, she has demonstrated fluency in English, French, Bengali, Punjabi, Urdu, Persian (acquired at age 35), and Spanish (acquired at age 51).
But he still demonstrates fluency in the language of the huckster.
Anderson is multilingual, demonstrating oral fluency in both English and Tagalog through his work; he also has some proficiency in Cebuano.
When you finally arrive in front of the mayor for the ceremony, unless both parties demonstrate fluency in French, you need to have a translator.
Her greeting was in the old American of Accord, but with an accent and a stiffness that demonstrated practice, but not fluency.
Required to demonstrate fluency in a modern foreign language, he offered the Kenyan tribal tongue, Kikuyu.