Learn French: Plus il utilise cette expression, plus il parle naturellement. - The more he uses this expression, the more naturally he speaks.

In English, we move the adverb ('naturally') to the front, right next to 'the more'. In French, the word order usually stays exactly the same as a normal sentence. You just put Plus at the beginning: il parle naturellement (he speaks naturally) becomes plus il parle naturellement (the more naturally he speaks).

Do I pronounce the 's' in Plus here?

Yes! Because the following word starts with a vowel (il), you make a strong liaison. The 's' in Plus is pronounced like a 'z', making it sound like 'plooz-eel'.

Do I need a connecting word like que or et between the two halves of the sentence?

No, just use a comma! The structure directly mirrors English: Plus [first part], plus [second part]. Adding a linking word like et (and) or que (that) is a common mistake, but it is unnecessary here.

How exactly is the adverb naturellement formed?

To make an adverb in French, you usually take the feminine form of the adjective and add -ment (which is similar to '-ly' in English). Here, the masculine adjective naturel becomes the feminine naturelle, and then we add -ment to get naturellement.