A Pasqua mangiamo in giardino se il tempo è bello.

With major holidays, Italian often uses a to mean at or on:

• a Natale = at Christmas
• a Pasqua = at Easter

So a Pasqua is the normal expression. English and Italian simply choose different prepositions here.

Holiday names usually appear without an article when you are talking about the holiday in a general way.

So:

• a Pasqua = at Easter
• not normally alla Pasqua

Using no article is the standard pattern in this kind of sentence.

It can mean either, depending on context.

In everyday Italian, a Pasqua often means at Easter / around Easter, but in a sentence like this it can also naturally be understood as on Easter Day, especially if you are talking about a meal.

So the exact nuance comes from the situation, not from the grammar alone.

Italian often uses the present tense to talk about:

• habits
• scheduled events
• near-future plans

So A Pasqua mangiamo in giardino can mean:

• At Easter we eat in the garden (habit)
• At Easter we’re eating in the garden
• At Easter we’ll eat in the garden

The time expression a Pasqua makes the time clear, so the present tense sounds perfectly natural.

Yes. A Pasqua mangeremo in giardino is also correct.

The difference is mainly one of style and nuance:

• mangiamo sounds very natural and conversational
• mangeremo sounds a bit more explicitly future-oriented

Italian uses the present tense for future events much more often than English does.

Because Italian usually does not need subject pronouns.

The verb ending already shows the subject:

• mangio = I eat
• mangi = you eat
• mangiamo = we eat

So mangiamo already means we eat / we’re eating / we will eat.
You would add noi only for emphasis or contrast:

• Noi mangiamo in giardino, loro dentro.
  We eat in the garden, they eat inside.

Both are possible, but they are not exactly the same.

• in giardino often means in the garden / out in the garden in a more general, natural way
• nel giardino means in the garden too, but it can sound more specific: in the particular garden

So:

• mangiamo in giardino = we eat out in the garden
• mangiamo nel giardino della nonna = we eat in Grandma’s garden

In your sentence, in giardino sounds very idiomatic.

Because this is a real, possible condition.

Italian commonly uses:

• se + present
• present in the main clause

So:

• Se il tempo è bello, mangiamo in giardino.

This works like English If the weather is nice, we eat / we’ll eat in the garden.

Italian does not normally use a future tense right after se in this kind of sentence. So se il tempo sarà bello would usually not be the normal choice here.

Tempo can mean both time and weather in Italian. The meaning depends on context.

Examples:

• Non ho tempo. = I don’t have time.
• Che tempo fa? = What’s the weather like?
• Il tempo è bello. = The weather is nice.

In your sentence, because it is followed by è bello, the meaning is clearly weather.

Italian normally uses bello for weather:

• bel tempo = nice weather
• il tempo è bello = the weather is nice

Buono usually means good in other senses, but it is not the normal adjective here. So il tempo è bello is the natural phrase.

Also, bello agrees with tempo, which is masculine singular.

The accent shows that è is the verb is from essere.

This matters because:

• e = and
• è = is

So:

• il tempo è bello = the weather is nice
• pane e formaggio = bread and cheese

The accent is essential in writing.

Yes. Italian word order is fairly flexible, as long as the meaning stays clear.

For example, you could also say:

• Se il tempo è bello, a Pasqua mangiamo in giardino.
• A Pasqua, se il tempo è bello, mangiamo in giardino.
• Mangiamo in giardino a Pasqua se il tempo è bello.

The original sentence is very natural because it starts with the time expression a Pasqua, then gives the main action, then the condition.