Pas je ještě platný.

to be

Breakdown of Pas je ještě platný.

• ještě: still
• pas: the passport
• platný: valid

Questions & Answers about Pas je ještě platný.

What does each word in Pas je ještě platný do grammatically?

• Pas = passport. It is the subject of the sentence.
• je = is, the 3rd person singular present form of být (to be).
• ještě = still in this sentence.
• platný = valid.

So the structure is basically:

passport + is + still + valid

This is a very normal Czech sentence pattern:
subject + form of být + adverb + adjective

Why is je used here?

Je is the present-tense form of být (to be) for he/she/it.

Since pas is a singular noun, Czech uses singular je:

• Pas je platný. = The passport is valid.

Compare:

• Pasy jsou platné. = The passports are valid.

So je agrees with the singular subject pas.

Why does the adjective end in -ý: platný?