Johan asked, "Should I say 'my English fluency' or 'my fluency in English'"?
Thank you for asking this interesting question. The short answer is that both forms are acceptable, and it's fine to use either one. The interesting part is how this extends to other phrases of this kind.
The phrase "my fluency in English" has the following grammatical structure:
(Note: Determiners are words like a/an, the, my, your, that, this, and all that come before nouns.)
This structure can often be shortened to:
determiner + noun 2 + noun 1
as in "my English fluency."
However, sometimes the short structure sounds awkward and even wrong, and other times the long form sounds awkward or wrong. Here is a good guideline to follow when you're not sure: When it's a simple phrase that people often use - in speech or in writing - it's best to use the short form. When it's a less common phrase, and it hasn't already been mentioned in your conversation or piece of writing, it's usually better to use the long form (determiner + noun 1 + prep + noun 2). Below are some examples.
