Breakdown of Oggi ho bisogno di una macchina.
una
a / an (feminine)
la macchina
the car
oggi
today
di
of, from
Questions & Answers about Oggi ho bisogno di una macchina.
Why does this sentence use ho (I have) instead of a verb for "to need"?
Why is there a di after bisogno?
The complete expression is avere bisogno di (to have need of). Whenever you specify what you need, you must connect it with the preposition di (of). So, ho bisogno di una macchina literally means "I have need of a car".
Why is there no word for "I" in this sentence?
In Italian, the subject pronoun (like io for "I") is usually dropped because the verb itself already tells you who is doing the action. Ho can only mean "I have", so saying io ho is not necessary unless you want to add special emphasis.