1da8f08e_Grammar__adverbs_of_frequency__WHEN
always often usually normally sometimes seldom rarely never [One day a week On nice days] always often usually normally sometimes seldom rarely never [WHEN] 
HOW OFTEN
W H O / W H A T
H O W O F T E N
D O E S
W H A T
W H E R E
W H E N
Grammar: adverbs of frequency
WHEN