Topik itu dianggap penting oleh dosen pembimbing.

Dianggap comes from the root anggap, which means to consider, to regard, or to think of as.

The prefix di- marks the verb as passive, so:

• menganggap = to consider
• dianggap = to be considered

So in this sentence, topik itu dianggap penting means that topic is considered important.

Indonesian uses the passive very naturally, often more often than English does.

Here, the topic being discussed is topik itu, so it is placed first as the subject/topic of the sentence:

• Topik itu dianggap penting = That topic is considered important

This structure is very common when the speaker wants to focus on the thing affected by the action, rather than the person doing the action.

An active version would be:

• Dosen pembimbing menganggap topik itu penting.
• The supervisor considers that topic important.

Both are correct, but the passive version puts the attention on the topic.

Oleh means by and introduces the doer of the action in a passive sentence.

So:

• Topik itu dianggap penting oleh dosen pembimbing.
• That topic is considered important by the supervisor.

Here:

• topik itu = the thing being considered
• oleh dosen pembimbing = the person who considers it important

In many Indonesian passive sentences, oleh can be omitted if the agent is clear or not important. For example:

• Topik itu dianggap penting.
• That topic is considered important.

This sounds natural and complete on its own.

Yes. Very often, Indonesian leaves out the agent in passive sentences.

So both are natural:

• Topik itu dianggap penting.
• Topik itu dianggap penting oleh dosen pembimbing.

Use oleh dosen pembimbing when you specifically want to say who considers it important.

In Indonesian, demonstratives like ini and itu usually come after the noun.

So:

• topik itu = that topic
• buku ini = this book
• rumah itu = that house

This is the normal word order in Indonesian.

Dosen means lecturer or university instructor.

Pembimbing comes from the root bimbing, meaning to guide. So pembimbing means guide, advisor, or supervisor.

Together, dosen pembimbing usually means:

• academic advisor
• thesis supervisor
• supervising lecturer

The exact English translation depends on context, but it refers to a lecturer who guides a student academically.

Indonesian often does not use a verb equivalent to to be in the present tense.

So where English says:

• That topic is important
• That topic is considered important

Indonesian can simply say:

• Topik itu penting
• Topik itu dianggap penting

There is no separate word for is here. This is completely normal in Indonesian.

Because penting is the description or judgment being assigned to the topic.

Compare:

• menganggap sesuatu penting = to consider something important
• dianggap penting = to be considered important

So in the active:

• Dosen pembimbing menganggap topik itu penting.

And in the passive:

• Topik itu dianggap penting oleh dosen pembimbing.

The adjective penting stays as the complement of anggap.

Yes, the meaning is slightly different.

• Topik itu penting = That topic is important

  • This sounds like a direct statement of fact or opinion.

• Topik itu dianggap penting = That topic is considered important

  • This emphasizes that this is someone's view, judgment, or accepted opinion.

So dianggap adds the idea of being seen or regarded as important, not just simply being important.

Yes, absolutely. That is the active version.

Compare:

• Dosen pembimbing menganggap topik itu penting.

  • The supervisor considers that topic important.

• Topik itu dianggap penting oleh dosen pembimbing.

  • That topic is considered important by the supervisor.

The difference is mainly focus:

• active = focus on dosen pembimbing
• passive = focus on topik itu

Both are grammatical and common.

No. Indonesian adjectives do not change for number or gender.

So penting stays the same in all cases:

• topik penting = important topic
• topik-topik penting = important topics
• itu penting = that is important

There is no agreement like in some other languages.

Many nouns could be used in the same structure. For example:

• Masalah itu dianggap serius oleh pemerintah.

  • That problem is considered serious by the government.

• Usulan itu dianggap baik oleh tim.

  • That proposal is considered good by the team.

So the pattern is very useful:

• [noun] + dianggap + [adjective] + oleh + [agent]

Examples:

• rencana itu dianggap realistis
• ide itu dianggap menarik
• penelitian itu dianggap penting

This makes dianggap a very practical word to learn.