Questions & Answers about Květináč má nejen podmisku, ale i odtokový otvor.
It means not only ... but also ....
So:
- nejen podmisku = not only a saucer
- ale i odtokový otvor = but also a drainage hole
This is a very common Czech pairing. You may also see close variants such as:
- nejen ..., ale také ...
- nejen ..., ale dokonce i ... (stronger: not only ..., but even ...)
In this sentence, the structure connects two things the flowerpot has.
Because it is in the accusative singular.
The verb mít (to have) normally takes a direct object in the accusative case. The flowerpot has something, so the things it has must be in the accusative:
- nominative: podmiska
- accusative: podmisku
This is a regular pattern for many feminine nouns ending in -a:
- kniha → knihu
- tužka → tužku
- podmiska → podmisku