English grammar_ Frequency adverb

1> classification

Adverbs indicating the number or frequency of actions ;

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1.1> The frequency must be

yearly	annually	monthly
Every year	Once a year	Monthly

weekly	daily	hourly
Every week	Every day	Every hour

once a week	four times a year
once a week	Four times a year

They celebrate their wedding anniversary annually.
They celebrate their wedding anniversary every year .

ce-le-bra-te	/ˈselɪbreɪt/	【v.】	Celebrate
wed	/wed/	【v.】	marry , marry
an-ni-ver-sary	/ˌænɪˈvɜːrsəri/	【n.】	Anniversary
an-nua-lly	/ˈænjuəli/	【adv.】	Once a year

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1.2> The frequency is uncertain

• always > usually > often > sometimes > seldom > never
• Always > Usually > often > Sometimes > Very few > never
• 9 > 8 > 7 > 2 > 0

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2> Frequency adverb position