1. The same letters, in the same, consecutive order, will create new words from the letter pairs below:

ET
ON
OR
SE

2. The same letters, in the same, consecutive order, will create new words from the words below:

ID
AD
ARE
ALL

Answers:

1. Each letter pair can be preceded by TEN:

TENET - TENON - TENOR - TENSE

2. Each word can be preceded by SQU:

SQUID - SQUAD - SQUARE - SQUALL