Questions & Answers about Il ristorante è aperto oggi.
ristorante ends in -e, so how do I know if it is masculine or feminine?
If ristorante ends in -e, why does the adjective aperto end in -o?
Adjectives must match the gender and number of the noun they describe, not just copy its exact ending letter. Since ristorante is a masculine singular noun, the adjective takes the standard masculine singular ending -o to become aperto.
How would I make this plural to say 'The restaurants are open today'?
Why does the word è have an accent mark?
The accent mark tells you this is the verb 'is', which connects the restaurant to being open. Without the accent mark, e means 'and', which would not make sense in this sentence.