La dentisto klarigis ne nur la anestezon, sed ankaŭ la injekton.

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Breakdown of La dentisto klarigis ne nur la anestezon, sed ankaŭ la injekton.

• sed: but
• ne: not
• ankaŭ: also

Questions & Answers about La dentisto klarigis ne nur la anestezon, sed ankaŭ la injekton.

Why do anestezon and injekton end in -n?

The -n ending marks the direct object in Esperanto.

In this sentence, the thing being explained is la anestezon and la injekton, so both nouns take -n:

• La dentisto klarigis la anestezon.
• La dentisto klarigis la injekton.

Because klarigis is a transitive verb, it needs an object: the dentist explained what? The anesthesia and the injection.

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What does ne nur ... sed ankaŭ ... mean, and how does it work?

Ne nur ... sed ankaŭ ... means not only ... but also ...

So:

• ne nur la anestezon = not only the anesthesia
• sed ankaŭ la injekton = but also the injection

It links two parallel parts of the sentence. Here, both linked parts are direct objects.

A simpler pattern is:

• Mi volas ne nur kafon, sed ankaŭ teon.
  • I want not only coffee, but also tea.

The important thing is that the two parts should match in function. In your sentence, both are nouns in the accusative.

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Why is there la before both anestezon and injekton?