Word formation: making nouns (units 1-3, II)

Make a noun from this word:

process

Make a noun from this word:

exist

Make a noun from this word:

celebrate

Make a noun from this word:

to ride

Make a noun from this word:

arrive

Make a noun from this word:

to inform

Make a noun from this word:

to decide

Make a noun from this word:

virtuous

Make a noun from this word:

tolerant

Make a noun from this word:

generous