Чим більше я повторюю правило, тим упевненіше мені говорити.

The more I repeat the rule, the more confidently I can speak.

Breakdown of Чим більше я повторюю правило, тим упевненіше мені говорити.

• я: I
• мені: me
• більше: more
• чим ... тим: the more ... the ...

Questions & Answers about Чим більше я повторюю правило, тим упевненіше мені говорити.

In this sentence, what does the structure чим ... тим ... mean, and how is it used?

The pair чим ... тим ... is a standard Ukrainian construction meaning “the more/less …, the more/less …” (a correlative comparative, like in English: “The more I study, the more I understand.”).

Pattern:

• Чим
  • comparative (clause 1), тим
    • comparative (clause 2)

In your sentence:

• Чим більше я повторюю правило – The more I repeat the rule
• тим упевненіше мені говорити – the more confidently it is for me to speak.

So the whole structure means: “The more I repeat the rule, the more confidently I can speak.”

Why do we use чим більше and тим упевненіше, and not just більше or упевненіше by themselves?

On their own, більше = more, упевненіше = more confidently.
To create the correlation “the more …, the more …”, Ukrainian uses a pair:

• чим (instrumental form of що, “what”) in the first clause
• тим (instrumental form of те, “that”) in the second clause

Literally it’s something like: “By what more I repeat the rule, by that more confidently it is for me to speak.”

Without чим … тим …, you would just have two unrelated “more” statements, not the linked idea of “the more X, the more Y.”