Es probable que cribemos el compost.

Because es probable que triggers the subjunctive.

In Spanish, expressions like es probable que, es posible que, es dudoso que, and puede que usually introduce something uncertain, expected, or not presented as a confirmed fact. That is why the verb after que goes in the subjunctive:

• Es probable que cribemos el compost.

Even though something is probable, it is still not certain, so Spanish uses the subjunctive.

Because the correct present subjunctive form of cribar for nosotros is cribemos, not cribamos.

Cribar is an -ar verb, so in the present subjunctive it takes these endings:

• yo críbe
• tú cribes
• él/ella cribe
• nosotros cribemos
• vosotros cribéis
• ellos criben

A quick way to build it:

1. Start from the yo form of the present indicative: cribo
2. Remove the -o: crib-
3. Add present subjunctive endings for -ar verbs: -e, -es, -e, -emos, -éis, -en

So:

• cribemos = correct
• cribamos = not correct for this verb

Here, cribar means something like to sift, to screen, or to pass through a sieve/screen.

With compost, it usually means separating the finer, usable compost from larger bits that have not fully broken down yet.

So in this context, cribar el compost is a gardening or composting action, not an abstract one.

It is a real and useful word, but it is not one of the most common everyday verbs for beginners.

In Spain, it can appear in:

• gardening and composting
• agriculture
• technical contexts
• figurative contexts, meaning to screen or to filter

Depending on context, you might also hear related verbs like:

• tamizar = to sift
• filtrar = to filter
• seleccionar = to screen/select

But for compost, cribar is perfectly natural.

In Spain, compost is commonly used, and it is usually masculine:

• el compost

In other Spanish-speaking regions, especially in some parts of Latin America, you may also hear:

• la composta

So this sentence sounds very natural for Spain Spanish.

Because que introduces the subordinate clause after es probable.

The structure is:

• Es probable que + subjunctive

So:

• Es probable que cribemos el compost.

That literally works like:

• It is probable that we sift the compost

In natural English you would say It’s likely we’ll sift the compost or similar, but Spanish needs que here.

Usually, no, not in the same way.

The normal pattern is:

• Es probable que + finite verb in the subjunctive

So:

• Es probable que cribemos el compost.

If you want to avoid the subordinate clause, Spanish more naturally uses other structures, but es probable que is the standard one here.

Yes. That is also correct.

• Es probable que cribemos el compost.
• Probablemente cribemos el compost.

Both mean roughly the same thing.

A small difference in feel:

• Es probable que... sounds a bit more structured or explicit
• Probablemente... is often a bit more direct and concise

Both are fine.

Because after es probable que, Spanish uses the subjunctive, not the future indicative.

So you say:

• Es probable que cribemos el compost.

Not:

• Es probable que cribaremos el compost.

The idea of future time is already understood from the context. The subjunctive here does not mean present-only; it can refer to a future action when the context makes that clear.

In this sentence, it most naturally means we will sift.

Although cribemos is grammatically the present subjunctive, after a phrase like es probable que, it often refers to a future action:

• Es probable que cribemos el compost.
  = It’s likely that we’ll sift the compost.

So the tense is present subjunctive in form, but the meaning is often future-looking.

Yes, it can be part of the nosotros imperative, but not here.

For example:

• Cribemos el compost. = Let’s sift the compost.
• No cribemos el compost todavía. = Let’s not sift the compost yet.

In your sentence, though, cribemos is not an imperative. It is a subjunctive form used after es probable que.

Because el compost is a thing, not a person.

The personal a is used before specific human direct objects, and sometimes pets or personified beings. But with objects like compost, there is no a:

• cribemos el compost = correct

Not:

• cribemos al compost

Usually compost refers to the material itself, but depending on context people may speak a bit loosely.

Most literally:

• el compost = compost, the decomposed organic material

If someone means the bin, heap, or pile, Spanish often uses more specific words such as:

• el compostador = composter/compost bin
• la compostera = compost bin/compost container in some varieties
• el montón de compost = compost pile

In your sentence, el compost most likely means the compost material being sifted.

In Spain Spanish, it is generally pronounced in a Spanish way, not exactly like English compost.

A learner-friendly approximation would be:

• kom-POST

The final t is pronounced, and the stress is on the last syllable because the word ends in a consonant other than n or s.

Yes. It sounds natural, especially in a gardening or composting context.

A Spain Spanish speaker could definitely say:

• Es probable que cribemos el compost.

It is a bit specific because of the verb cribar, but grammatically and idiomatically it is completely fine.