1. What do the following words have in common?

DUE

STAR

YEAR

FOUND

2. What do the following words have in common?

TEE

YOU

HEAL

BREAD

HINTS:

1. The change involves the same four letters for each word.

2. The change involves the same two letters for each word.

Answers:

1. Each word becomes a new one by the addition of LING.

DUELING/STARLING/YEARLING/FOUNDLING

2. Each word becomes a new one by the addition of TH.

TEETH/YOUTH/HEALTH/BREADTH

Credit: NY Times Crossword - July 29, 2007

Brendan Emmett Quigley - TH-TH-TH-THAT'S ALL FOLKS