bangohan ga dekitara, kazokuzenin de tabemasu.

できたら is the -tara conditional form of できる.

• Dictionary form: できる
• Past form: できた
• Conditional: できたら

So:

• 晩ご飯ができたら = when/if dinner is ready

In this sentence, たら is very naturally understood as when rather than a doubtful if, because dinner becoming ready is an expected event.

Yes, できる often means can do / be able to do, but it also has another very common meaning: to be completed, to be finished, or to be ready.

With food, ～ができる often means:

• the food is ready
• the meal is done
• it has been prepared

So 晩ご飯ができたら does not mean if dinner can do something. It means when dinner is ready.

Here, が marks 晩ご飯 as the thing that becomes ready.

• 晩ご飯ができる = dinner gets ready / dinner is ready
• が is the natural particle with this expression

Using は is possible in some contexts, but it would shift the nuance toward as for dinner... or create contrast.

In this sentence, the speaker is simply stating the condition:

• When dinner is ready, ...

So 晩ご飯ができたら sounds most natural.

Technically, たら can mean either if or when, depending on context.

In this sentence, when is the best translation because the event is expected to happen:

• dinner will be ready
• then the family will eat

So although the grammar is conditional, the natural sense is:

• When dinner is ready, we eat.

If the situation were less certain, if could make more sense in English.

家族全員で means with the whole family, all the family together, or as a whole family group.

Breakdown:

• 家族 = family
• 全員 = everyone / all members
• で = as a group / together with

So this part emphasizes that the meal is eaten all together, not separately.

In this sentence, で shows the group involved in doing the action together.

So:

• 家族全員で食べます = we eat with the whole family / the whole family eats together

This use of で often appears with groups:

• みんなで行きます = we all go together
• 家族で旅行します = we travel as a family

It is not the location で here. It is the group-participation で.

Yes, but it means something slightly different.

• 家族全員で食べます emphasizes eating together as a group
• 家族全員が食べます emphasizes every family member is the one who eats

So:

• で = focus on doing it together
• が = focus on who does it

In your sentence, で is more natural because the idea is about a shared family mealtime.

Japanese often uses the non-past form (食べます) for:

• habitual actions
• future actions
• general routines

So 食べます here can mean:

• we eat
• we will eat

depending on context.

The sentence sounds like either:

1. a general family habit: When dinner is ready, we eat together as a family, or
2. a future action: When dinner is ready, we’ll eat together as a family

Japanese does not need a separate future tense the way English often does.

Yes, the subject is omitted, which is very normal in Japanese.

The sentence does not explicitly say:

• we eat
• they eat
• my family eats

Instead, Japanese leaves that to context.

Because the sentence mentions 家族全員で, the listener naturally understands something like:

• we eat together as a whole family or
• the whole family eats together

Japanese very often omits subjects when they are obvious.

The comma separates the conditional clause from the main clause:

• 晩ご飯ができたら、 = when dinner is ready,
• 家族全員で食べます。 = we eat together as a whole family.

It works much like a pause in English. Japanese punctuation is often somewhat flexible, but here the comma helps readability.

Yes. Japanese word order is flexible as long as the particles make the roles clear.

For example, you could also say:

• 晩ご飯ができたら、家族全員で食べます。
• 家族全員で、晩ご飯ができたら食べます。

But the original order is the most natural because it presents:

1. the condition first
2. the main action second

That is a very common pattern in Japanese.

They are similar, but the nuance is a little different.

• 晩ご飯（ばんごはん） = dinner, everyday and casual
• 夕飯（ゆうはん） = dinner, also common and casual
• 夕食（ゆうしょく） = dinner/evening meal, a bit more formal or neutral

In this sentence, 晩ご飯 sounds warm, natural, and everyday—very suitable for family life.

It can be either, depending on context.

Without extra context, it often sounds like a habitual family routine:

• When dinner is ready, we eat together as a family.

But in the right situation, it can also refer to one future occasion:

• When dinner is ready, we’ll eat together as a family.

Japanese often leaves that distinction to context instead of marking it explicitly.