Learn Italian: Ieri mi sono piaciuti quegli oggetti da sistemare. - Yesterday I liked those objects to fix up.

When you want to express that a noun has a specific purpose or needs something done to it, Italian uses da followed by the infinitive verb. Here, oggetti da sistemare means "objects to fix up" or "objects that need to be fixed".

Why is it mi sono piaciuti instead of "ho piaciuto"?

The verb piacere (to like) actually works like "to be pleasing to". The sentence literally means "Yesterday those objects were pleasing to me". In the past tense, piacere always takes the helping verb essere (here, sono).

Why does piaciuti end in "-i"?

Because the sentence uses the helping verb essere, the past participle (piaciuto) must match the subject. The subject doing the pleasing is quegli oggetti (masculine plural), so the ending becomes -i.

Why does the sentence use quegli instead of quei for "those"?

Quegli is the masculine plural form of "those" used before words starting with a vowel (like oggetti), as well as words starting with z or s + consonant. If the word started with most other consonants, you would use quei instead.