Tämä kirja on erittäin hyvä.

From Lesson 339:Attitude adverbs·Finnish

Breakdown of Tämä kirja on erittäin hyvä.

tämä
this
olla
to be
kirja
book
hyvä
good
erittäin
extremely

Questions & Answers about Tämä kirja on erittäin hyvä.

How would I add an attitude adverb like onneksi (fortunately) to this sentence, and where does it go?
Attitude adverbs usually go at the very beginning of the sentence or right after the verb. You could say Onneksi tämä kirja on erittäin hyvä to emphasize the luck of the situation, or Tämä kirja on onneksi erittäin hyvä for the most natural flow. Note that it should never split the adjective phrase erittäin hyvä.
Is erittäin considered a sentence-modifying adverb of attitude here?
No, in this sentence, erittäin acts as a degree adverb (an intensifier) modifying only the adjective hyvä, not the whole sentence. Attitude adverbs express the speaker's feelings about the entire fact, whereas erittäin just scales the quality of the book.
How does erittäin differ from other intensifiers like todella or tosi?
Erittäin specifically translates to 'extremely' or 'highly' and carries a slightly more formal, elevated tone. It is much more standard than the highly colloquial tosi (really), while todella (truly/really) sits comfortably in both written and spoken Finnish.
If I change the sentence to plural, saying 'These books are extremely good', does erittäin change its ending?
No, adverbs do not agree with the noun or adjective they modify. You would say Nämä kirjat ovat erittäin hyviä. The word erittäin remains exactly the same, even though the pronoun, noun, verb, and adjective all change to reflect the plural.

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