Ég verð líklega heima í kvöld.

Verð is the 1st person singular present tense of verða.

In many contexts verða means become, but in this sentence it means will be. So:

• ég verð = I will be
• ég verð heima = I will be at home

The time phrase í kvöld makes the future meaning clear.

That is very normal in Icelandic. Icelandic often uses a present-tense verb when a future time is already clear from context.

Here, í kvöld tells you the action is in the future, so verð is understood as will be.

This is similar to how English can sometimes say things like I’m staying home tonight, where a present form refers to the future.

Líklega is an adverb meaning probably.

It modifies the whole statement:

• Ég verð heima í kvöld. = I will be home tonight.
• Ég verð líklega heima í kvöld. = I will probably be home tonight.

In neutral word order, adverbs like líklega often come after the finite verb, which is why it appears after verð.

Because that is a very natural Icelandic word order in a main clause.

The basic pattern here is:

• subject + finite verb + adverb + rest

So:

• Ég = subject
• verð = finite verb
• líklega = adverb

That gives Ég verð líklega heima í kvöld.

You can also front the adverb for emphasis:

• Líklega verð ég heima í kvöld.

But then Icelandic keeps the verb in the second position, so it is verð ég, not ég verð.

Heima is an adverb, not a noun.

It means at home or home in the sense of location.

So:

• Ég er heima. = I am at home.
• Ég verð heima í kvöld. = I will be home tonight.

English uses home in a way that looks noun-like, but in Icelandic heima is treated as an adverb of place.

This is a very common and important distinction:

• heima = at home (location, no movement)
• heim = home / to home (direction, movement toward home)

Compare:

• Ég er heima. = I am at home.
• Ég verð heima í kvöld. = I will be at home tonight.
• Ég fer heim. = I am going home.

In your sentence, the speaker is talking about being at home, not going home, so heima is correct.

Í kvöld is a fixed and very common time expression meaning tonight.

Word-for-word, í often means in, but in time expressions you should usually learn the whole phrase together:

• í dag = today
• í morgun = this morning
• í kvöld = tonight

So it is best to treat í kvöld as one unit of meaning.

The phrase í kvöld uses accusative in this time expression.

A small complication is that kvöld is a neuter noun, and in the singular its nominative and accusative forms look the same, so you do not see a visible ending change here.

Also, with time expressions like this, it is often most useful just to memorize the whole phrase:

• í kvöld
• í dag
• í morgun

That will help more than trying to analyze every detail at first.

Yes. That is grammatical and natural.

The difference is mainly emphasis and information structure:

• Ég verð líklega heima í kvöld. = neutral, everyday word order
• Líklega verð ég heima í kvöld. = puts a little more focus on probably

This is a good example of Icelandic’s verb-second pattern: when líklega comes first, the finite verb verð still comes next.

Yes, but they are slightly different in feel.

• Ég verð heima í kvöld = very natural, common way to say I’ll be home tonight
• Ég mun vera heima í kvöld = grammatical, but more formal or more explicitly predictive
• Ég er heima í kvöld = also possible when the time phrase makes the future clear, but verð more directly matches will be

So for a learner, Ég verð líklega heima í kvöld is an excellent everyday model.

A rough English-friendly guide would be:

yeg verth LIK-le-ga HAY-ma ee kvoelt

A few notes:

• Ég begins with a y sound.
• ð in verð is like the th in this, though in real speech it can be quite soft.
• heima begins with hei-, roughly like hay.
• kvöld has a sound English does not match perfectly; the ö is not the same as normal English o.

If you want to sound more natural, it is best to listen to native audio and copy the rhythm of the whole sentence, not just the individual words.