Je garde une copie de la lettre recommandée dans le dossier bleu.

Garde is the present tense of garder, with je.

So Je garde is the 1st person singular present indicative and can mean things like:

• I keep
• I am keeping
• I store
• I keep a copy

In French, the present tense often covers both the English simple present and present continuous, depending on context.

Copie is a feminine singular countable noun, so French normally needs an article before it.

• une copie = a copy
• la copie = the copy

Here, une is used because it means a copy, not a specific already-identified copy.

French usually does not drop the article the way English sometimes can. So Je garde copie... would not be normal in everyday French.

The de shows the relationship copy of the letter.

So:

• une copie de... = a copy of...

Then la lettre recommandée means the registered letter, a specific letter. Because it is specific, French keeps the definite article:

• de la lettre recommandée = of the registered letter

A useful detail:

• de + le becomes du
• de + la stays de la

So here it is de la, not du, because lettre is feminine.

Because recommandée is describing lettre, and lettre is a feminine singular noun.

French adjectives usually agree with the noun they describe in gender and number:

• masculine singular: recommandé
• feminine singular: recommandée
• masculine plural: recommandés
• feminine plural: recommandées

So:

• un courrier recommandé
• une lettre recommandée

In French, many adjectives come after the noun, especially adjectives that are more descriptive or classifying.

So lettre recommandée is the normal order.

This is very common in French:

• une voiture rouge
• un dossier bleu
• une lettre recommandée

Some adjectives often come before the noun, but recommandé is not normally one of them.

Literally, it looks like that, but in real usage it means registered letter or recorded delivery letter, depending on context.

This is a good example of why word-for-word translation can be misleading. In postal French, recommandé / recommandée has a specific administrative meaning.

So a learner should understand it as a set expression:

• lettre recommandée = registered letter

Dans means in or inside, and a folder is treated as something you put papers inside.

So:

• dans le dossier bleu = in the blue folder

Le is used because it refers to a specific folder, not just any blue folder.

This is the most natural neutral wording in French:

• Je garde une copie ... dans le dossier bleu

Because bleu agrees with dossier, and dossier is masculine singular.

So:

• un dossier bleu
• une chemise bleue for a feminine noun

The adjective must match the noun it describes, not the nearest English idea in your head.

Here:

• dossier = masculine singular
• therefore bleu = masculine singular

In this sentence, it most naturally describes where the copy is kept.

So the idea is:

• I keep a copy of the registered letter in the blue folder

A French speaker will normally understand dans le dossier bleu as the location of garde une copie, not as part of la lettre recommandée.

If you wanted to make a different meaning very clear, you would usually rephrase the sentence.

Yes, but the given order is the most neutral and natural.

Standard order here is:

• Je garde
  • object + place

So:

• Je garde une copie de la lettre recommandée dans le dossier bleu.

You could also say:

• Dans le dossier bleu, je garde une copie de la lettre recommandée.

That version puts extra emphasis on dans le dossier bleu. The meaning stays basically the same, but the focus changes.