Breakdown of Necesitamos una sierra afiladísima para el tronco grande.
una
a, an (feminine)
necesitar
to need
grande
big
para
for
Questions & Answers about Necesitamos una sierra afiladísima para el tronco grande.
How does afiladísima work here instead of just saying muy afilada?
Adding the suffix -ísimo (or -ísima for feminine words) creates an absolute superlative, meaning 'extremely' or 'super'. Here, it takes the adjective afilada (sharp), drops the final vowel, and adds -ísima to mean 'extremely sharp'. It sounds a bit more natural and emphatic than just saying muy afilada.
Why do we use para instead of por in this sentence?
I know sierra as a mountain range. Does it just mean 'saw' here?
Yes! Sierra translates directly to 'saw' as a cutting tool. Because a mountain range has a jagged, saw-like profile, the word is also used geographically (like the Sierra Madre). The physical tool is actually the original meaning of the word.
Why is it tronco grande and not gran tronco?