Read the excerpts and decide if they are from a semi-formal or informal letter.

Choose the correct option.

The expression "It would be a good idea if you called HR and asked them" is from a [semi-formal letter|informal letter].

The expression "So sorry to tell you that I'm leaving the company" is from a [semi-formal letter |informal letter].

The expression "I can assure you that it will not happen again" is from a **** [semi-formal letter|informal letter].