Question

how to change nouns to verbs

Answer 1

We can change nouns into verbs by adding suffixes like -en, -ise, -ate, -ify, -ing etc..
Here are some examples to help you understand- 

Class- Classify
Character-Characterise
Captive- Captivate
Dark-Darken
Pure-Purify
Apology-Apologise.
Note-Notify

You can also change nouns into verb by removing some letters at end of the word and changing them. Here are examples-

Proposal-Propose
Decision- Decide
Argument-Argue
Failure-Fail
Presentation-Present
Investment-Invest
Detection-Detect

It depends on how the nouns can be changed into verbs so you need to think about how we can change the nouns to verbs without making any mistake.