Hindi ko alam kung kailan ang takda.

Here is the breakdown:

• Hindi = not
• ko = my / me / by me, depending on the structure; here it marks I
• alam = know / known
• kung = introduces an indirect question
• kailan = when
• ang = topic marker
• takda = appointed time, set date, deadline, or due date depending on context

A very literal feel of the sentence is:

• Hindi ko alam = It is not known by me / I do not know
• kung kailan ang takda = when the set date/deadline is

So the whole sentence means I don’t know when the deadline is or I don’t know when the set date is.

Because Filipino uses different pronoun forms depending on grammatical role.

• ako is the ang-form pronoun
• ko is the ng-form pronoun

In the expression alam ko, the experiencer is normally marked with ko, not ako.

So:

• Alam ko = I know
• Hindi ko alam = I don’t know

Using ako here would sound wrong in standard Filipino.

That is because alam behaves more like a state than like a typical English-style action verb.

So alam ko is literally closer to:

• known to me

And hindi ko alam is closer to:

• not known to me

But in natural English, that becomes I don’t know.

This kind of structure is very common in Filipino.

In Filipino, kung often introduces an embedded or indirect question.

So after verbs or expressions like:

• alam = know
• tanong = ask
• naaalala = remember

you often get a structure like:

• kung sino = who
• kung saan = where
• kung kailan = when
• kung paano = how

So:

• Hindi ko alam kung kailan ang takda = I don’t know when the deadline is

Here, kailan gives the meaning when, and kung signals that this is an indirect question clause.

Yes, kung can also mean if in other sentences.

For example:

• Kung uulan, hindi tayo aalis. = If it rains, we won’t leave.

But in your sentence, kung is not really translating if. It is introducing an indirect question:

• kung kailan = when
• kung saan = where
• kung sino = who

So the meaning comes from the question word, and kung is just part of the normal structure.

Because ang marks the noun phrase as the topic or focus of that small clause.

In kailan ang takda, the phrase ang takda is the thing being identified in relation to time.

Compare:

• Kailan ang klase? = When is the class?
• Kailan ang exam? = When is the exam?
• Kailan ang takda? = When is the deadline / set date?

Without ang, the sentence would sound incomplete or less standard in this structure.

Because Filipino often prefers a predicate-first structure.

So the natural order is:

• Kailan ang takda? = When is the deadline?

This is more natural than:

• Ang takda ay kailan?

That second version is possible, but it sounds more formal, marked, or rhetorical.

Inside your full sentence, kung kailan ang takda keeps the more natural order.

Here, takda is functioning as a noun.

In context, it can mean:

• appointed time
• assigned date
• deadline
• due date

But takda can also be related to the idea of setting or assigning something in other contexts.

So learners should remember that this word can be flexible, but in ang takda, it is clearly being used as a noun.

It is understandable, but in everyday speech many Filipinos would simply say:

• deadline
• due date

So a more conversational sentence might be:

• Hindi ko alam kung kailan ang deadline.

Your sentence is still valid, but takda may sound a bit more formal, literary, or context-dependent than deadline.

Yes. ’Di is a common shortened form of hindi in speech and informal writing.

So both are possible:

• Hindi ko alam kung kailan ang takda.
• ’Di ko alam kung kailan ang takda.

The full form hindi is more neutral and standard.

In this sentence, alam expresses a present state: know / be aware.

If you want past or future, Filipino often uses different forms:

• Hindi ko nalaman kung kailan ang takda. = I did not find out when the deadline was.
• Hindi ko malalaman kung kailan ang takda. = I will not know when the deadline is / I won’t be able to know when the deadline is.

So alam itself is the basic state, while forms like nalaman and malalaman add aspect or time-related meaning.

No, not in normal standard Filipino.

The short pronoun ko is an enclitic, and it usually comes very early in the sentence, after the first word or expression.

So the correct order is:

• Hindi ko alam

not:

• Hindi alam ko

This early placement of pronouns like ko, mo, niya, and particles like ba, na, pa is something learners need to get used to.

A rough literal gloss is:

• Hindi = not
• ko = by me / to me
• alam = known
• kung = whether / indirect-question marker
• kailan = when
• ang takda = the set date / the deadline

So the overall feel is something like:

• It is not known to me when the deadline is.

That is not natural English, but it helps show how the Filipino structure works.