Asumimos que el plan es correcto.

Asumimos is the 1st person plural present indicative of asumir:

• yo asumo
• tú asumes
• él/ella/usted asume
• nosotros/nosotras asumimos
• vosotros/vosotras asumís
• ellos/ellas/ustedes asumen

So asumimos means we assume in this sentence.

One small thing to notice: with some verbs, the nosotros form in the present can look the same as the preterite form. For asumir, asumimos can mean either:

• we assume (present)
• we assumed (preterite)

The surrounding context normally tells you which one is meant.

You can usually just say asumimos.

Spanish often drops subject pronouns because the verb ending already tells you who the subject is. In this case, -imos tells you it is we.

So both are possible:

• Asumimos que el plan es correcto.
• Nosotros asumimos que el plan es correcto.

Adding nosotros gives extra emphasis or contrast, for example:

• Nosotros asumimos que el plan es correcto, pero ellos no.

Here, que means that and introduces a subordinate clause:

• Asumimos = main verb
• que el plan es correcto = what we are assuming

So it works like English We assume that the plan is correct.

In English, that is often omitted:

• We assume the plan is correct

In Spanish, que is normally kept in this kind of sentence.

Spanish uses the definite article el more often than English does.

So el plan means the plan. In this sentence, it refers to a specific plan already known in the context.

You generally would not say Asumimos que plan es correcto. That sounds incomplete or ungrammatical here.

Spanish usually uses ser for qualities seen as inherent, defining, or evaluative, and estar for states, conditions, or locations.

Here, correcto means something like correct / right / valid, which is being treated as a judgment about the plan itself, so:

• el plan es correcto

That is the normal choice.

Very broadly:

• ser + adjective = what something is like
• estar + adjective = how something is / its current state

So es correcto is the natural phrasing here.

Because asumir que presents the content as something accepted or taken as true, not as doubtful, wished for, or hypothetical in the same way that triggers the subjunctive.

So Spanish uses the indicative:

• Asumimos que el plan es correcto.

Compare this with verbs or expressions that often trigger the subjunctive because they express doubt, denial, emotion, or uncertainty:

• Dudamos que el plan sea correcto.
• No creemos que el plan sea correcto.

But with asumimos que, the normal choice is indicative:

• ...que el plan es correcto

Correcto is an adjective, and it agrees with the noun it describes: el plan.

Since plan is:

• masculine
• singular

the adjective is also:

• correcto (masculine singular)

If the noun changed, the adjective would change too:

• el plan correcto
• la idea correcta
• los planes correctos
• las ideas correctas

Yes, often you can, but there can be a slight difference in nuance.

• suponemos = we suppose / we assume
• asumimos = we assume / we take it for granted / we accept as a premise

In many contexts, both work:

• Suponemos que el plan es correcto.
• Asumimos que el plan es correcto.

A rough distinction:

• suponer can sound like a mental guess or supposition
• asumir can sound more like accepting something as a working assumption

In formal, academic, or logical contexts, asumir is very common.

Yes. Asumir can also mean to take on, to accept, or to take responsibility for, depending on context.

For example:

• Asumió el cargo. = He/She took up the position.
• Asumimos la responsabilidad. = We took responsibility.

So learners should not expect it to mean only assume in every sentence. In your sentence, though, asumimos que... clearly means we assume that...

This is the most neutral and natural order:

• Asumimos = main verb first
• que el plan es correcto = clause that follows

Spanish word order is flexible, but not every change sounds equally natural. For example, you could front part of the sentence for emphasis in special contexts, but the basic version is the best one to learn first:

• Asumimos que el plan es correcto.

That is the standard way to say it.

A few useful points:

• Asumimos: stress on mi → a-su-MI-mos
• que sounds like keh
• plan is one syllable
• correcto: stress on rec → co-RREC-to

In standard Peninsular Spanish pronunciation:

• c before e/i is often pronounced like the th in think
• so correcto sounds roughly like ko-RREK-to, because that c is before t, not e/i
• but in words like cena, many speakers in Spain use a th sound

Also, the rr sound in correcto is a strong rolled/trilled sound because it is written rr.

Yes, asumimos by itself can be ambiguous in form, because it can be:

• present: we assume
• preterite: we assumed

Without context, both are possible in writing. However, if the meaning shown to the learner is present, then the sentence is being read as:

• We assume that the plan is correct.

If it were clearly past in a larger context, it could also mean:

• We assumed that the plan was/is correct

Context resolves that ambiguity.

There are several natural adjectives depending on the exact meaning:

• correcto = correct / right
• adecuado = appropriate / suitable
• válido = valid
• acertado = right / sound / well judged

So you might also hear:

• Asumimos que el plan es válido.
• Asumimos que el plan es adecuado.

But correcto is perfectly natural and straightforward.