I studied tips for this section and have a question about this instruction:
"Informal vs formal forms of address
The ty forms (pronoun and/or the verb) above are informal singular, in the sense that they are used for addressing single individuals with whom you are on a first name basis or who are much younger than you." Where it says pronoun, I understand that, but what verb are they talking about when they say "and/or the verb"? Thank you.