Learn Hardcore Turkish: Sandalet giymeden plaja gitmemeliyim. - I shouldn’t go to the beach without wearing sandals.

-meden is the negative adverbial suffix meaning “without doing X.” You attach it to a verb root to express “without [verb]-ing.” Here, giymek (“to wear”) → root giy- + -meden → giymeden, “without wearing.” Together with sandalet, it means “without wearing sandals.”

How do we form the negative necessity gitmemeliyim?

To say “I should not” or “I must not” in Turkish, combine:

verb root (here git-, “to go”)
the negative marker -me- → gitme-
the necessity suffix -meli/-malı → gitmemeli
the 1st person sg. ending -yim (with vowel harmony) → gitmemeliyim.

Why is the sentence phrased as a negative necessity (“should not go”) instead of a positive one (“should go”)?

Because the speaker wants to advise against going barefoot: “I shouldn’t go to the beach without wearing sandals.” If you wanted to say “I should go,” you’d remove the negative marker and say gitmeliyim.

Why is sandalet singular rather than plural (sandaletler)?

In Turkish, clothing and footwear often appear in the singular when referring to a pair (“sandalet” implicitly means “a pair of sandals”). Using sandaletler (“sandals” pl.) is possible but not necessary.

Why does the subordinate clause come before the main clause here?

Turkish typically places subordinate (conditional, temporal, etc.) clauses before the main clause. So Sandalet giymeden (“without wearing sandals”) naturally precedes plaja gitmemeliyim (“I shouldn’t go to the beach”).

Is giymeden irregular?

The base verb giymek has a root giy- that retains the y before vowel-initial suffixes. When you add -meden, the y stays, giving giymeden. It’s just regular vowel‐consonant harmony at work.

How would you say “I shouldn’t go to the beach without wearing shoes” using ayakkabı (“shoe”)?

Replace sandalet with ayakkabı:
Ayakkabı giymeden plaja gitmemeliyim.
This literally means “I shouldn’t go to the beach without wearing shoes.”