Not only... but also (ekki bara... heldur líka)

Selling a ridiculously versatile survival tool requires persuasive language. Emphasize that a product offers multiple benefits using the correlative conjunction ekki bara... heldur líka (not only... but also).

This is not only a pocket knife, but also a weapon.
Þetta er ekki bara vasahnífur, heldur líka vopn.

Case Matching

The elements linked by ekki bara and heldur líka must match in case. If the verb takes an accusative object, both objects in the conjunction must be accusative.

The salesman shows not only the pocket knife, but also the tool.
Sölumaðurinn sýnir ekki bara vasahnífinn, heldur líka tólið.

Adjectives linked this way must both agree with the noun they describe.

I find the salesman not only funny, but also intelligent.
Mér finnst sölumaðurinn ekki bara fyndinn, heldur líka gáfaður.

Indeclinable adjectives (which never change form) pair perfectly with standard ones in this structure:

The tool is not only multipurpose, but also very cheap.
Tólið er ekki bara fjölnota, heldur líka mjög ódýrt.

Connecting Longer Phrases

You can also connect entire prepositional or infinitive phrases to highlight exactly what your new tool can do.

You can use it not only to cut the meat, but also to chop the wood.
Þú getur notað það ekki bara til að skera kjötið, heldur líka til að höggva viðinn.