Eu sempre coloco moedas no bolso do casaco.

Yes. In Portuguese, subject pronouns are often omitted because the verb ending already shows who is doing the action.

• coloco = I put / I place
• So Eu sempre coloco moedas no bolso do casaco can also be:
  • Sempre coloco moedas no bolso do casaco.

Including Eu can add:

• emphasis
• contrast
• clarity

For example:

• Eu sempre coloco moedas no bolso do casaco, mas ela nunca coloca.

Coloco is the 1st person singular present tense form of colocar.

• colocar = to put, to place
• eu coloco = I put / I place

In this sentence, the present tense usually expresses a habitual action:

• Eu sempre coloco... = I always put...

Other forms of colocar in the present:

• eu coloco
• você / ele / ela coloca
• nós colocamos
• vocês / eles / elas colocam

Sempre means always, and in Portuguese it commonly goes before the main verb:

• Eu sempre coloco moedas...

This is the most natural and neutral placement here.

Other positions are sometimes possible, but they may sound less natural or give a different emphasis:

• Eu coloco sempre moedas... — possible, but less common here
• Sempre coloco moedas... — also natural, especially without Eu

So for learners, subject + sempre + verb is a very good pattern to remember.

Because moedas specifically means coins.

• moeda = coin
• moedas = coins
• dinheiro = money (in general)

So:

• coloco moedas = I put coins
• coloco dinheiro = I put money

If the sentence is specifically talking about coins, moedas is the correct word.

Because no is the contraction of:

• em + o = no

So:

• no bolso = in the pocket

This kind of contraction is required in normal Portuguese.

Some common examples:

• em + a = na
• em + os = nos
• em + as = nas

So you say:

• no bolso not
• em o bolso

This is a very common question. Portuguese often uses em with verbs of placement where English uses in or into.

So:

• colocar no bolso literally looks like put in the pocket
• but it can naturally mean put into the pocket

The idea of movement is already clear from the verb colocar (to put), so Portuguese does not always need a separate word like into.

Do is the contraction of:

• de + o = do

So:

• do casaco = of the coat

The phrase bolso do casaco literally means:

• pocket of the coat

In English, we usually say:

• the coat pocket

But Portuguese often uses this noun + de + noun structure:

• a porta da casa = the door of the house / the house door
• o bolso do casaco = the pocket of the coat / the coat pocket

Portuguese uses definite articles more often than English.

Here:

• o bolso = the pocket
• o casaco = the coat
• no = em + o
• do = de + o

So the full phrase is built very naturally in Portuguese:

• no bolso do casaco

English often drops articles in places where Portuguese keeps them, especially with:

• clothes
• body parts
• possessions
• things understood from context

Because the sentence is talking about putting the coins into one pocket.

• bolso = pocket
• bolsos = pockets

So:

• no bolso do casaco = in the coat pocket / in the pocket of the coat
• nos bolsos do casaco = in the coat pockets

The singular is the natural choice if the speaker means one specific pocket.

Because bolso is a masculine noun.

• o bolso = the pocket
• um bolso = a pocket

That is why the contractions are masculine too:

• no bolso = em + o bolso
• do casaco = de + o casaco

If the noun were feminine, you would see forms like:

• na
• da

Yes.

The original sentence:

• Eu sempre coloco moedas no bolso do casaco.

This can sound like:

• the coat, in a general or context-known sense

If you want to make it clearly my coat, you can say:

• Eu sempre coloco moedas no bolso do meu casaco.

That is also very natural.

Compare:

• no bolso do casaco = in the coat pocket / in the pocket of the coat
• no bolso do meu casaco = in my coat pocket

Yes. In Portuguese, the simple present is commonly used for habits and repeated actions.

So:

• Eu sempre coloco moedas... = I always put coins...

It does not have to mean only what is happening right now. It often means:

• something you do regularly
• a routine
• a habit

That is very similar to English I always put...

Yes, but some versions are more natural than others.

Most natural:

• Eu sempre coloco moedas no bolso do casaco.
• Sempre coloco moedas no bolso do casaco.

Possible, but with different emphasis:

• Eu coloco moedas no bolso do casaco sempre.
• Moedas eu sempre coloco no bolso do casaco.

For learners, the safest default is:

• Subject + sempre + verb + object + place

So this sentence is a very good model:

• Eu sempre coloco moedas no bolso do casaco.

In everyday speech, a Brazilian speaker might still say it exactly like this. But a few natural variations are also common:

• Sempre coloco moedas no bolso do casaco.
• Eu sempre ponho moedas no bolso do casaco.

Here, ponho comes from pôr (to put), which is also very common in speech.

So both are natural:

• coloco = put/place
• ponho = put

For learners, coloco is often easier to work with at first because the verb colocar is very regular.