Masakit ang bibig ko, kaya hindi ako makainom ng mainit na kape.

Filipino often leaves out the verb to be in simple descriptive sentences.

So Masakit ang bibig ko is literally something like Painful my mouth, but the natural English meaning is My mouth hurts or My mouth is sore.

A more formal or bookish version can include ay:

Ang bibig ko ay masakit.

But in everyday speech, Masakit ang bibig ko is very normal.

Here, ang marks the noun phrase being talked about — often called the topic or subject-like topic.

So in:

Masakit ang bibig ko

• masakit = painful / sore
• ang bibig ko = my mouth

A helpful way to think about it is:

• masakit = the comment being made
• ang bibig ko = what that comment is about

So ang is not exactly the same as English the.

In Filipino, possessive pronouns usually come after the noun.

So:

• bibig ko = my mouth
• kape ko = my coffee
• bahay ko = my house

This is the normal order. English puts my before the noun, but Filipino puts ko after it.

Because Filipino pronouns change form depending on their role in the sentence.

In this sentence:

• ko in bibig ko means my and is a possessive/genitive form
• ako in hindi ako makainom means I and is a subject/topic form

So:

• ko = my / me
• ako = I

This is a very common pattern in Filipino pronouns.

Yes, literally it is close to My mouth is painful/sore, but in natural English we usually say My mouth hurts.

Filipino often uses an adjective with a body part to express pain:

• Masakit ang ulo ko = My head hurts
• Masakit ang tiyan ko = My stomach hurts
• Masakit ang bibig ko = My mouth hurts

So this is a normal Filipino way to talk about pain.

Here, kaya means so, therefore, or that’s why.

In the sentence:

Masakit ang bibig ko, kaya hindi ako makainom ng mainit na kape.

it connects the two ideas:

• my mouth hurts
• so I can’t drink hot coffee

So kaya is acting as a conjunction of result.

Hindi normally comes before the part being negated, and hindi ako makainom is the most natural neutral word order.

So:

• Hindi ako makainom = I cannot drink

You can also say:

• Ako ay hindi makainom

but that sounds a bit more formal or emphatic.

Ako hindi makainom is possible in some contexts, but it sounds more contrastive, like As for me, I can’t drink.

So for ordinary speech, hindi ako makainom is the best pattern to learn.

Makainom comes from the root inom = drink.

The prefix maka- often adds the idea of ability, opportunity, or being able to do something.

So here:

• makainom = be able to drink
• hindi ako makainom = I cannot drink / I am unable to drink

If you used uminom, it would simply mean drink or to drink, without clearly adding the idea of ability.

Compare:

• Umiinom ako ng kape. = I drink coffee / I am drinking coffee.
• Hindi ako makainom ng kape. = I can’t drink coffee.

So makainom is the right choice here because the sentence is about not being able to drink hot coffee.

That ng marks the thing being drunk — in other words, the object of the action.

So:

• makainom ng kape = to be able to drink coffee
• makainom ng mainit na kape = to be able to drink hot coffee

In this kind of actor-focused sentence, the thing affected by the action is commonly marked with ng.

So the structure is:

• ako = the one who would drink
• ng mainit na kape = what would be drunk

That na is a linker. It connects the adjective to the noun.

So:

• mainit = hot
• kape = coffee
• mainit na kape = hot coffee

This linker is very common in Filipino.

A useful rule:

• if the first word ends in a consonant, use na
• if it ends in a vowel or n, you often use -ng

Since mainit ends in t, we use na:

• mainit na kape

Also, do not confuse this na with the separate ng before the whole phrase:

• ng = object marker
• na = linker between mainit and kape

You could, but it is not the most neutral way to say it here.

• mainit na kape = hot coffee
• kape na mainit = coffee that is hot

The second version sounds more contrastive or descriptive, as if you are distinguishing it from some other kind of coffee.

So in this sentence, mainit na kape is the most natural choice.

Bibig usually means mouth in general, though in everyday use it can sometimes overlap a little with the mouth area.

If you specifically mean lips, the word is:

• labi = lip
• mga labi = lips

So:

• Masakit ang bibig ko = My mouth hurts
• Masakit ang labi ko = My lip hurts

In your sentence, bibig is the normal word if the pain is in the mouth generally, especially because it affects drinking hot coffee.