Usually we use 'sangat' in daily conversation.While 'amat' is usually use in essays or speeches,but sometime we use 'sangat' too.

1. Amat --> Extremely / So / Really * Ex: "Extremely shocked" ( amat mengejutkan ) * Ex: "It's so difficult!" ( ia amat sukar! ) * Ex: "I really like it!" ( saya amat menyukainya! ) 2. Sangat --> Very / Really * Ex: "It's very interesting" ( ia sangat menarik ) * Ex: "I'm very disappointed" ( saya sangat kecewa) * Ex: "It's really good" ( ia sangat bagus )