Which one is better? Which one is more natural? I'm writing a lesson review for a teacher on Italki website. I wanted to express that I'm grateful for the lesson, in particular for new English phrases. Although I provided the topic at the very last moment, the teacher was able to extend my vocabulary during the lesson without prior preparation.
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You can say a good knowledge of, a deep knowledge of, an extensive knowledge of, or a wide knowledge of.
However, the phrase "a good knowledge of" is the most common and idiomatic.
Khan
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"Wide", "extensive", and "deep" could all work.