due
The Italian word 'do' is a conjugation of the verb 'dare' which means 'to give'. However, in this context, 'due' is an adjective that means 'due' or 'owed'. It is used to express something that is expected or required, often in relation to time or payment. For example, 'la bolletta è dovuta il 15 del mese' means 'the bill is due on the 15th of the month'.
What should I do now?
This sentence uses 'devo' which is the first person singular present tense of the verb 'dovere' which means 'to have to' or 'must'. It is commonly used to express should in questions. 'Cosa' means 'What', 'ora' implies 'now' and 'fare' translates to 'do'. So, the whole phrase translates to 'What should I do now?'.
Do what you have to do.
The sentence uses 'Fai' which is the second person singular imperative of the verb 'fare' which means 'do'. 'Quello che' translates to 'what', and 'devi fare' means 'you have to do'. Hence, the entire phrase translates to 'Do what you have to do'.
I want to pack my bags for the trip.
The sentence uses 'fare' as part of the phrase 'fare le mie valigie' which translates to 'pack my bags'. 'Voglio' means 'I want to', 'le mie valigie' means 'my bags', 'per' means 'for', and 'il viaggio' translates to 'the trip'. The whole sentence translates to 'I want to pack my bags for the trip'.