Post la matenmanĝo ni metas la buteron kaj la fromaĝon en la fridujon.

The ending -as marks the present tense in Esperanto. So metas means put or are putting.

Esperanto tense endings are very regular:

• metas = present
• metis = past
• metos = future

In a sentence like this, metas often describes a routine or a general action, such as something we normally do after breakfast. If you wanted to say that it happened once in the past, you would usually use metis.

They have -n because they are the direct objects of metas.

The verb meti means to put, and the things being put are:

• la buteron
• la fromaĝon

In Esperanto, the direct object usually takes the accusative ending -n.

So:

• butero = butter

• buteron = butter as the direct object

• fromaĝo = cheese
• fromaĝon = cheese as the direct object

This is a very common Esperanto pattern. After a preposition, -n can show motion toward a place.

So:

• en la fridujo = in the fridge
• en la fridujon = into the fridge

Here the butter and cheese are being moved into the fridge, so fridujon takes -n.

This is often called the accusative of direction.

Yes. In Esperanto, en can cover both ideas.

The difference is usually shown by whether the noun has -n:

• en la fridujo = in the fridge
• en la fridujon = into the fridge

So the preposition stays the same, and the ending shows whether there is movement into the place.

Post is a preposition meaning after.

So post la matenmanĝo is a time expression meaning after breakfast.

Unlike fridujon, matenmanĝo does not take -n here, because there is no motion toward it. It is just the object of the preposition post.

Yes, you can.

There is a small difference in feel:

• post la matenmanĝo = after the breakfast, meaning a specific breakfast, such as today's breakfast
• post matenmanĝo = after breakfast, more general

Both are natural. The version with la points more clearly to a particular, understood breakfast.

Yes. Matenmanĝo is made from:

• mateno = morning
• manĝo = meal, eating

So matenmanĝo literally means morning meal.

Esperanto forms many everyday words this way. For example:

• tagmanĝo = lunch, midday meal
• vespermanĝo = dinner, evening meal

Fridujo is also built from smaller parts:

• frid- = cold
• -uj- = container, holder, place for something
• -o = noun ending

So fridujo literally means something like a container/place for cold things.

That is why it means fridge or refrigerator.

Not always, but repeating it is very normal and often clearer.

So both of these can work:

• la buteron kaj la fromaĝon
• la buteron kaj fromaĝon

The version with both la words makes it very clear that both nouns are definite. That is why it is common in careful or teaching-style Esperanto.

Because they are being used as mass nouns, just like butter and cheese often are in English.

In Esperanto, substances are usually singular unless you mean different kinds or separate items.

So:

• butero = butter as a substance
• fromaĝo = cheese as a substance

But:

• buteroj could mean kinds or brands of butter
• fromaĝoj could mean kinds of cheese or separate cheeses

Esperanto word order is fairly flexible, because endings show what each word is doing.

This sentence uses a very neutral order:

• time phrase
• subject
• verb
• objects
• direction/place

So Post la matenmanĝo ni metas la buteron kaj la fromaĝon en la fridujon sounds straightforward and natural.

But other orders are also possible, for example:

• Ni metas la buteron kaj la fromaĝon en la fridujon post la matenmanĝo

That still makes sense. The main difference is emphasis and style, not basic meaning.

A few pronunciation points are especially useful here:

• ĝ sounds like the s in measure
• j sounds like English y
• stress is always on the second-to-last syllable

So:

• matenmanĝo = ma-ten-MAN-ĝo
• fromaĝo = fro-MA-ĝo
• fridujo = fri-DU-jo

That regular stress pattern is one of the nice things about Esperanto pronunciation.