1. The following phrases have something in common that has nothing to do with their meanings. Can you determine what it is?

HOLIDAY CARD
LIGHT STANDARDS
SCHOOL NOTES

2. What do the following words have in common?

NUB
TENS
GENT

Answers:

1. Both words in each phrase can be preceded by HIGH to make two new phrases. 

2. Each word can be changed into a new one by adding the letters ILE:

NUBILE
TENSILE
GENTILE