Dnes večer ti chci napsat dopis.

This evening I want to write you a letter.

Breakdown of Dnes večer ti chci napsat dopis.

• já: I
• chtít: to want
• dnes: today
• večer: the evening

Questions & Answers about Dnes večer ti chci napsat dopis.

Why is there no word for I in this sentence?

Czech often drops subject pronouns when they are clear from the verb form.

Here, chci means I want, so the subject I is already built into the verb. You could say Já dnes večer ti chci napsat dopis, but já is usually unnecessary unless you want emphasis or contrast.

What does dnes večer mean, and why are there two words?

Dnes means today, and večer means evening. Together, dnes večer means this evening / tonight.

This is a very common Czech time expression. Czech often uses simple adverbial expressions like this without a preposition.

Why is it ti and not something like tebe or tě?

Ti is the dative form of ty and means to you / for you.

In this sentence, the verb idea is write a letter to someone, so Czech uses the dative for the person receiving the letter:

• napsat ti dopis = write you a letter / write a letter to you

By contrast:

• tě is usually accusative or genitive, not dative
• tebe is the stressed/full form, used for emphasis or after some prepositions

So ti is the normal unstressed form here.