a)
- adulthood, neighbourhood
- friendship, membership, partnership, relationship
- curiosity, generosity, possibility
- awareness, happiness, illness, kindness, sadness
- boredom, freedom, wisdom
- celebration, frustration, imagination, temptation
- achievement, amazement, disappointment, excitement, improvement
c)
- adult - adulthood
- relation - relationship
- free - freedom
- curious - curiosity
- happy - happiness
- celebrate - celebration
- disappoint - disappointment
The two endings which often cause a change are -(a)tion and -ity
d)
- angry
- shameful
- deadly
- dangerous
- believe
- hate
- lose
- remember
f)
- loss
- amazement
- relationship
- possibility
- danger
- disappointment
- belief
- imagination