In the situation where your friend needs some money to buy a backpack you can say, "You should ask your parents for some money" or "You should find a part-time job to get that money," both sentences using the modal auxiliary "should".
What is a modal auxiliary
A modal auxiliary verb is used to indicate ability, possibility, suggestion, intent, etc. Unlike other verbs, it does not change depending on whether the subject is plural or singular. Modal auxiliaries are also not followed by "to".
In the sentences above, in used the auxiliary "should" to indicate a suggestion. We are telling our friend that he should ask his parents for money or find a part-time job.
Learn more about modal auxiliary verbs here:
https://brainly.com/question/6250914
