I've heard a lot about you, sir. Now I finally have the chance to meet you in person.
先生,久仰大名,现在终于让我亲自见到你了。
I asked him to buy it for me, but he wouldn't.
我请他帮我买,但是他不肯。
is as the proportion of the total vocabulary of his mother tongue against those words of his own baby talk that are taken up into the vernacular of his family.