For me, 'forming' is the decision to have a coalition, but 'formation' would have more to do with the actual make-up of the constitution, with the arguing about who has which post, etc.
Exam - Examination- no real difference- 'exam' is an abbreviation, so is not used formally in the names and on the certificates.
a say - saying - a say - express your opinion, saying - proverb, idiom, etc
a fight - fighting - a fight- the contest, fighting - the activity
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