noun
1
BAD : According to Henry's opinion, less money should be spent on weapons.
GOOD : In Henry's opinion, less money should be spent on weapons.
GOOD : According to Henry, less money should be spent on weapons.
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according to sb : 'According to Peter, deforestation is a serious problem.'
in sb's opinion (NOT according to ... opinion ): 'In Peter's opinion, deforestation is a very serious problem.'
2
BAD : They are not afraid of saying their opinions.
GOOD : They are not afraid of expressing their opinions.
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express/give your opinion (NOT say ): 'The newspapers express a wide range of political opinions.'