The following words can be changed into new ones according to a certain pattern. Can you determine the pattern and the new words?

1. DOT
2. LAD
3. NUT
4. TAPE
5. TALC
6. DARES
7. FESTER

HINT:
ALB could be added to the list.

Answers:

Adding the letter "I" twice to each word gives you a new word:

1. DOT - IDIOT
2. LAD - ILIAD
3. NUT - INUIT
4. TAPE -TAIPEI
5. TALC - ITALIC
6. DARES - DIARIES
7. FESTER - FIESTIER
    (ALB - ALIBI) 

Credit:
Will Shortz
The Puzzlemaster Presents Vol. 2
AYE! AYE!