Infinitiv "čitati" lako prepoznajem, ali mi je prezent glagola "moći" još težak.

Because the sentence is mentioning those words as words, not using them normally inside the sentence.

This is the same idea as English:

• the verb to read
• the word can

So in Croatian, writing čitati and moći in quotation marks shows: “I am talking about these forms themselves.”

Infinitiv means the infinitive, the basic dictionary form of a verb.

For example:

• čitati = infinitive
• English equivalent: to read

In Croatian, infinitives often end in:

• -ti → čitati
• -ći → moći

So Infinitiv čitati means “the infinitive form čitati.”

Here prezent is a noun, and it means the present tense.

So:

• prezent glagola moći = “the present tense of the verb moći”

English speakers sometimes expect a tense name to behave more like a label, but in Croatian it is an ordinary noun here, so it can take modifiers and case relationships just like other nouns.

Because Croatian uses the genitive after another noun in expressions like this.

So:

• glagol = verb
• glagola = of the verb

That means:

• prezent glagola moći = the present tense of the verb moći

This is a very common pattern in Croatian grammar language:

• infinitiv glagola...
• prezent glagola...
• perfekt glagola...

No. Moći is being cited as a verb form/name, so it stays in the infinitive.

In other words, only glagola changes for the grammar of the sentence. The cited verb itself usually stays in its dictionary form.

Compare in English:

• the present tense of the verb to be

You do not change to be there either. Croatian works similarly:

• prezent glagola moći

Prepoznajem is 1st person singular present: I recognize / I identify.

So the subject is understood as I.

Croatian often leaves subject pronouns unstated when the verb ending already shows the person:

• prepoznajem = I recognize
• no need to say ja unless you want emphasis

Also, this form is connected with the imperfective verb prepoznavati. That is why it looks different from the simpler dictionary form some learners may expect.

Literally, mi je means something like to me is.

• mi = to me
• je = is

So:

• mi je težak = “is difficult for me”

Croatian often uses this kind of structure for personal experience or judgment.

A fuller, more emphatic version would be:

• meni je težak

But in normal speech, the short clitic form mi is much more common.

Because težak agrees with prezent, which is a masculine singular noun.

Here the structure is basically:

• prezent ... je težak
• “the present tense ... is difficult”

Since prezent is masculine singular, the adjective must also be masculine singular:

• težak

If the sentence were built differently, you could get teško, for example:

• Teško mi je s prezentom glagola moći.
• “The present tense of moći is hard for me.”

But in the original sentence, the adjective is describing prezent, so težak is correct.

Here još means still.

So:

• još težak = still difficult

It suggests progress: the speaker already finds one thing easy, but this other thing has not become easy yet.

Because mi and je are clitics: short unstressed words that usually appear very early in the clause.

So after ali (“but”), it is natural to get:

• ali mi je prezent...

This word order sounds normal and idiomatic in Croatian.

English speakers often want to place words more freely based on English habits, but Croatian clitics have fairly strict placement rules. In a neutral sentence, mi je should stay near the beginning of the clause.

Because moći is an irregular verb in the present tense, and its forms do not look as predictable as many regular verbs.

Its present forms are:

• mogu = I can
• možeš = you can
• može = he/she/it can
• možemo = we can
• možete = you can
• mogu = they can

So the speaker is saying that they can easily identify the infinitive čitati, but the present-tense forms of moći are still hard for them to master.