Si el café está muy amargo, añado un poco de leche.

Because they are two different words:

• si = if
• sí = yes or oneself in some contexts

So in Si el café está muy amargo, añado un poco de leche, si introduces a condition: If the coffee is very bitter, I add a little milk.

Spanish often uses estar for temporary states or conditions, and ser for more essential characteristics.

Here, el café está muy amargo means the coffee tastes or is very bitter right now. That is understood as a current condition of this particular coffee, so estar is natural.

Compare:

• El café está amargo. = This coffee tastes bitter / is bitter right now.
• El café es amargo. = Coffee is bitter by nature, or bitterness is being described as a general characteristic.

In this sentence, the speaker is reacting to the taste of a specific cup, so está fits better.

Because amargo agrees with el café, and café is masculine.

• el café → masculine singular
• adjective must match → amargo

So:

• el café amargo
• la bebida amarga

Even though coffee is a liquid, the adjective agrees with the noun café, not with the idea of the drink being liquid.

Añado is the first-person singular present tense of añadir:

• yo añado = I add

The full subject yo is usually omitted in Spanish because the verb ending already shows who the subject is.

So:

• añado un poco de leche = I add a little milk

Other forms of añadir in the present:

• yo añado
• tú añades
• él/ella añade
• nosotros añadimos
• vosotros añadís
• ellos/ellas añaden

Because Spanish often leaves out subject pronouns when they are not needed.

The ending in añado already tells you the subject is I. So yo would usually only be added for emphasis, contrast, or clarity.

• Añado un poco de leche. = normal
• Yo añado un poco de leche. = more emphatic, like I add a little milk

Because this sentence describes a habitual action or a general rule:

• Si el café está muy amargo, añado un poco de leche.
• If the coffee is very bitter, I add a little milk.

This is a common pattern in Spanish for things that happen regularly or generally:

• Si tengo tiempo, voy al gimnasio.
• If I have time, I go to the gym.

So this is not mainly about one future event; it is about what the speaker normally does.

Yes, but it means something slightly different.

• Si el café está muy amargo, añado un poco de leche.
  = This is what I usually do / what I do in that situation.

• Si el café está muy amargo, añadiré un poco de leche.
  = If the coffee is very bitter, I will add a little milk.

So the original sentence sounds more like a habit or routine, while the future version sounds like a decision about a specific future case.

Because the sentence begins with a conditional clause:

• Si el café está muy amargo, ...

In Spanish, when a clause like this comes first, a comma is commonly used before the main clause.

So:

• Si el café está muy amargo, añado un poco de leche.

If the order is reversed, the comma is often not used:

• Añado un poco de leche si el café está muy amargo.

Both are correct; the first version simply starts with the condition.

Un poco de means a little or a bit of.

So:

• un poco de leche = a little milk

This is a very common structure in Spanish:

• un poco de agua = a little water
• un poco de azúcar = a little sugar
• un poco de tiempo = a little time

You need de after un poco when it is followed by a noun.

Because un poco de + noun is the normal expression for a little / a bit of something.

Una poca leche is not the usual standard way to say this. A learner should use:

• un poco de leche

There is also poca leche, but that means little milk / not much milk, and it works differently:

• Añado un poco de leche. = I add a little milk.
• Hay poca leche. = There is little milk.

So un poco de is the correct expression here.

Spanish often uses the definite article more than English does.

Here, el café refers naturally to the coffee in question, such as the coffee the speaker is drinking. In English, we might sometimes say just coffee, but Spanish often prefers the article with a specific or understood item.

So:

• el café está muy amargo = the coffee is very bitter

Without the article, café would sound less natural here.

Yes. Echo is very natural in everyday Spanish too.

• añado = I add
• echo = I pour in / put in / add

In this context, both work well:

• Si el café está muy amargo, añado un poco de leche.
• Si el café está muy amargo, echo un poco de leche.

In Spain, echar leche al café is especially common in everyday speech.

They describe different tastes:

• amargo = bitter
• agrio = sour

Coffee can be amargo. Milk that has gone bad might be agria. Lemon is agrio.

So in this sentence, amargo is definitely the right word.

The ñ is pronounced like the ny sound in canyon.

So añado sounds roughly like ah-NYAH-doh.

A few pronunciation notes:

• café → stress on the last syllable: ca-FÉ
• está → stress on the last syllable: es-TÁ
• añado → stress naturally on the middle syllable: a-ÑA-do

The accent marks in café and está show where the stress goes.

Yes. You can also say:

• Añado un poco de leche si el café está muy amargo.

This means basically the same thing.

The original version:

• Si el café está muy amargo, añado un poco de leche.

puts the condition first, which often sounds a bit more natural when you want to set up the situation first: If the coffee is very bitter, ...

So both are correct, but the original structure is very common and clear.