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

Choose the correct option.

The expression "I'm sorry but I can't come on Saturday" is from a [semi-formal letter |informal letter].

The expression "I am writing to request information about your new course" is from a [semi-formal letter |informal letter].

The expression "Many thanks for your letter" is from a [semi-formal letter|informal letter].