Binabasa ko ang aralin sa kuwaderno gabi-gabi.

Binabasa comes from the root basa, meaning read.

It is formed with:

• -in- infix
• reduplication of the first syllable of the root

So the pattern is roughly:

basa → binabasa

This form is the imperfective form of an object-focus verb. In context, it can mean:

• is reading
• reads
• sometimes has been reading

Because the sentence also has gabi-gabi (every night), the most natural interpretation is habitual: reads every night.

Filipino pronouns change form depending on their grammatical role.

Here, ko is used because the verb binabasa is in object focus, so the doer of the action is marked with the genitive pronoun set.

• ko = I / my in the genitive set
• ako = I in the nominative or ang-marked set

So in this sentence:

• ko = I as the one doing the reading
• ang aralin = the thing being read

That is why Binabasa ko... is correct here, not Binabasa ako...

Because binabasa is an object-focus verb.

In Filipino, the verb often tells you which part of the sentence gets marked by ang. With binabasa, the thing being acted on—the thing being read—is the ang phrase.

So:

• ang aralin = the lesson, the thing being read
• ko = the reader

This is different from an actor-focus version such as:

Nagbabasa ako ng aralin gabi-gabi.

There:

• ako is the ang-type element
• ng aralin is the object

So the choice of verb form affects the markers in the sentence.

Here, aralin is a noun, meaning lesson or study material.

You can tell because it is marked by ang and functions as the thing being read:

ang aralin = the lesson

This can be confusing because aral and aralin can also appear in verb-related forms in other contexts. But in this sentence, aralin is clearly being used as a noun.

Sa kuwaderno means something like in the notebook or on the notebook, depending on context.

The marker sa is very broad. It can mark:

• location
• direction
• destination
• a general place relationship

So sa kuwaderno suggests that the lesson is located or written there.

In English, we might choose:

• in the notebook
• on the notebook
• sometimes even from the notebook, depending on the situation

Filipino often leaves that relationship a little broader with sa.

If you want to make ownership clearer, you might also hear:

• sa kuwaderno ko = in my notebook
• sa aking kuwaderno = in my notebook

This is a very common Filipino pattern.

Repeating a time word often gives the meaning every or regularly at that time.

So:

• gabi = night
• gabi-gabi = every night / night after night

Similar examples:

• araw-araw = every day
• umaga-umaga = every morning
• linggo-linggo = every week

So gabi-gabi adds a habitual sense to the sentence.

Not exactly in the English sense.

Filipino is usually described as focusing more on aspect than on tense.

The form binabasa is imperfective, which usually means the action is:

• ongoing
• repeated
• habitual
• not viewed as completed

So without any time expression, Binabasa ko ang aralin could mean:

• I am reading the lesson
• I read the lesson (habitually)

Because the sentence includes gabi-gabi, the habitual reading becomes the most likely meaning: I read the lesson every night.

Because verb-initial order is very common in Filipino.

A normal Filipino sentence often starts with the verb, followed by other parts such as:

• the actor
• the ang phrase
• location or time expressions

So this pattern is natural:

Binabasa + ko + ang aralin + sa kuwaderno + gabi-gabi

Even though English usually starts with the subject, Filipino often does not.

Yes, but the structure and emphasis would change.

For example:

Nagbabasa ako ng aralin sa kuwaderno gabi-gabi.

That version uses actor focus:

• ako is now the main marked participant
• ng aralin is the object

By contrast, your original sentence uses object focus:

• binabasa ko
• ang aralin

Both can be grammatical, but they organize the sentence differently. The original sentence gives more grammatical prominence to the lesson.

No. A learner might worry about that, but native speakers understand sa kuwaderno as a location relationship for the lesson, not that the person is somehow inside the notebook.

The phrase naturally suggests that the lesson is written or found there.

Still, if you want to be extra clear, context helps a lot. Some speakers might prefer a fuller phrase such as:

• Binabasa ko ang aralin sa kuwaderno ko gabi-gabi.
• Binabasa ko gabi-gabi ang araling nasa kuwaderno.

But your original sentence is understandable as referring to the lesson in the notebook.