to write
The Italian verb 'scrivere' translates to 'to write' in English. It is used exactly the same way in Italian as you’d use 'to write' in English. It encompasses the act of writing anything - from writing a book, 'scrivere un libro', to writing an email, 'scrivere una mail'.
I want to write a book
This sentence is an example of expressing a desire or intention to do something, in this case, the verb 'write' ('scrivere') is used in its infinitive form to express the action that the speaker wants to perform.
You should write a letter
The example given here highlights the use of 'scrivere' in a recommendation or suggestion context. The modal verb 'dovresti' (should) is used to indicate advice or suggestion, followed by the action that is suggested - to write a letter.
Can I write on the blackboard?
In this sentence, 'scrivere' is put in a question context. Here, the speaker is asking for permission to perform the action of writing on the blackboard. It is common to use the verb 'posso' (can) when asking for permission to do something in Italian.