‘mad’ is an interesting word – it has many, many meanings. The 3 most common meanings are: 1. crazy (ie sick in the head), 2. angry (usually we say mad *at* someone) or 3. very excited (usually we say mad *about* someone). In all meanings of mad, there is a core idea of passion. In modern US slang, some young people even use ‘mad’ to mean ‘very’ – eg He is mad clever. But it’s better to stick to the 3 main uses of ‘mad’ when you talk yourself, in order to be clearly understood.
A: I’m so mad! You forgot my birthday and you didn’t even say sorry!
B: Look, I’m really sorry. You know I’m mad about you. I just had a really busy day. Let me buy you dinner. Don’t be mad at me.
A: Ok, let me find my keys… Oh, no, where are my keys? I thought I put them on the table.
B: I didn’t see them on the table.
A: Oh no, I’m going mad! Look – I put them in the fridge!
Which meaning does each mad in the example have???