bed
The Italian word for 'bed' is 'letto'. It's used in the same context as English: for sleeping or resting. For instance, 'Vado a letto' means 'I am going to bed'.
I read an interesting book yesterday.
This sentence is in the past tense, indicating an action that has been completed. 'Letto' in this context is the past participle of the verb 'leggere', meaning 'to read'.
My son has already read the fairy tale.
In this example, 'letto' functions as the past participle of the verb 'leggere'. The verb 'ha letto' is a compound tense in the present perfect, indicating an action in the recent past.
My bed is very comfortable.
Here, 'letto' is a noun meaning 'bed'. It is part of a simple sentence, which states a fact about the speaker's bed being comfortable.