Saya butuh sedikit lagi waktu untuk menyelesaikan tugas akhir.

Butuh means need.

In this sentence, Saya butuh sedikit lagi waktu... means I need a little more time...

About register:

• butuh is very common in everyday Indonesian.
• It is natural and not rude.
• In more formal writing or speech, you may also see membutuhkan.

So:

• Saya butuh sedikit lagi waktu = everyday, natural
• Saya membutuhkan sedikit lagi waktu = more formal

Yes.

All of these can work:

• Saya butuh sedikit lagi waktu
• Saya perlu sedikit lagi waktu
• Saya membutuhkan sedikit lagi waktu

The differences are mostly about style:

• butuh = common, spoken, natural
• perlu = also common, slightly more neutral/formal
• membutuhkan = more formal and heavier in tone

For daily conversation, butuh is perfectly normal.

It means a little more time.

A helpful way to break it down is:

• sedikit = a little, a small amount
• lagi = more, additional
• waktu = time

So together, sedikit lagi waktu means a little more time or some additional time.

Even though English uses more before time, Indonesian often builds the idea with sedikit + lagi.

No, not in this sentence.

Lagi has several meanings in Indonesian, and one of them is again, but here it means more or additional.

Examples:

• makan lagi = eat again
• sedikit lagi = a little more
• dua hari lagi = two more days / in two days

So in your sentence, lagi is not repeating the action. It is adding more time.

Both are understandable, but sedikit waktu lagi is often more natural in everyday Indonesian.

Compare:

• Saya butuh sedikit lagi waktu = I need a little more time
• Saya butuh sedikit waktu lagi = I need a little more time

The meaning is basically the same.

A simple way to think about it:

• sedikit lagi waktu puts a little more together
• sedikit waktu lagi sounds a bit more conversational and common to many speakers

So if you want a very natural everyday version, Saya butuh sedikit waktu lagi is an excellent choice.

Untuk means to or in order to here.

It introduces the purpose:

• Saya butuh sedikit lagi waktu = I need a little more time
• untuk menyelesaikan tugas akhir = to finish the final project/thesis

So the full idea is: I need a little more time in order to finish my final project/thesis.

Because menyelesaikan means to complete/finish something, while selesai usually means finished or complete.

Here is the difference:

• selesai = be finished
• menyelesaikan = finish/complete something

So:

• Saya menyelesaikan tugas akhir = I finish/complete the final project
• Tugas akhir saya selesai = My final project is finished

In your sentence, the speaker is talking about the action of completing the project, so menyelesaikan fits well.

Menyelesaikan comes from the base selesai.

Very roughly:

• selesai = finished, complete
• menyelesaikan = to make something finished, to complete something

The pattern meN- ... -kan often turns a base into an active verb that affects an object.

Here:

• base: selesai
• verb: menyelesaikan
• object: tugas akhir

So menyelesaikan tugas akhir literally has the sense of bringing the final project to completion.

You do not need to analyze every affix every time, but it is useful to recognize that menyelesaikan is a transitive verb, so it normally takes an object.

Tugas akhir is a common academic term in Indonesian.

Depending on the school or university context, it can mean:

• final project
• final paper
• capstone project
• thesis

It is often a fixed expression, not just any assignment that happens to be last.

So in many contexts, tugas akhir refers to a major piece of academic work done at the end of a program.

Because Indonesian usually puts descriptions after the noun.

So:

• tugas akhir = final assignment/project
• rumah besar = big house
• buku baru = new book

This is different from English, where adjectives usually come before the noun.

In this case, tugas akhir is also a set academic expression, so it is especially natural in that order.

Sometimes, yes.

In conversation, Indonesian often drops the subject when it is already clear from context.

So you might hear:

• Butuh sedikit waktu lagi untuk menyelesaikan tugas akhir.

That can still mean I need a little more time to finish the final project if the context makes the subject obvious.

However:

• Saya butuh... is clearer
• It is a complete, safe form for learners
• It sounds perfectly natural

So yes, omission is possible, but keeping saya is a good default.

No. Indonesian does not have articles like English a and the.

So:

• tugas akhir can mean a final project, the final project, or just final project
• The exact meaning depends on context

In your sentence, people naturally understand it as the relevant final project or thesis the speaker is working on.

That is very normal in Indonesian.