Breakdown of Probablemente el filtro de aceite está muy sucio.
de
from / of
estar
to be (location/state)
sucio
dirty
muy
very
el aceite
oil
probablemente
probably
el filtro
filter
Questions & Answers about Probablemente el filtro de aceite está muy sucio.
Why is está in the indicative mood here instead of the subjunctive?
Adverbs of doubt like probablemente, posiblemente, tal vez, and quizá(s) can take either the indicative or the subjunctive. Using the indicative (está) means the speaker feels a high degree of certainty—they are fairly confident the filter is dirty based on evidence or experience. If they wanted to express more doubt or a wilder guess, they would use the subjunctive (esté).
If I move probablemente to the middle of the sentence, does the rule about choosing the indicative or subjunctive change?
Yes! If you place an adverb of doubt after the verb (for example, El filtro de aceite está probablemente muy sucio), you are forced to use the indicative mood. The option to choose the subjunctive to show a lower level of certainty only exists when these adverbs are placed before the verb.
Since we are making a strong factual statement about the filter, why do we use estar instead of ser?
The choice between ser and estar depends on what you are describing, not how certain you are that it is true. Being dirty (sucio) is a physical condition or state of the filter, not an inherent, defining characteristic. Therefore, you must use estar regardless of whether you are guessing or stating a fact.
Why doesn't probablemente have a written accent mark?
In Spanish, adverbs ending in -mente inherit the written accent mark (or lack thereof) from the adjective they are based on. Because the adjective probable naturally stresses the second-to-last syllable and ends in a vowel, it doesn't need a written accent. Therefore, probablemente doesn't get one either.
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