1, He is too old to wear this coloured shirt
--> He is not young enough to wear this coloured shirt
2, She is too weak to carry this box
--> She is not strong enough to carry this box
3. This pen is too expensive for me to buy 
--. This pen is not cheap enough for me to buy
4, Bill was too stupid to understand what I had said 
--> Bill was not smart enough to understand what i had said
5, This bag is too heavy for her to carry 
--> This bag is not light enough for her to carry
6, the test was too difficult for them to do 
--> The test was not easy enough for them to do
7, I'm too poor to helf you with the money
--> I am not rich enough to help you with the money
8, This book is too dull to read 
--> This book is not smart enough to read
9, The room is too dark for us to study
--> The room is not bright enough for us to study
10, The shelf is too high for her to reach 
--> The shelf is not low enough for her to read