She doesn't study every day.

[keannu]

Is this a partial negation or a whole negation? I mean if this means "She sometimes studies and sometimes not" or "She never studies every day".

gz212)She doesn't study every day.

[5jj]

Context!

She doesn't study every day. It's her brother who does that.
She doesn't study every day. Who told you that she did?
She doesn't study every day. She spends all day, every day, at her computer, but she's playing games.
She doesn't study every day. She takes Sundays off.

"She never studies every day" is unnatural. If she never studies, then 'every day' is superfluous.

[Rover_KE]

It means 'On some days she studies and on others she doesn't'.

Rover

[Sepmre]

It means she may studies or may not. So some days she may studies and some days may not.

When you say "She never studies every day" You've made such a certain negation which much more probably wants to said "she doesn't study"

[Rover_KE]

It means she may studies or may not. So some days she may studies and some days may not.

When you say "She never studies every day" You've made such a certain negation which much more probably wants to said "she doesn't study"

Your contribution is ungrammatical, Sepmre.

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Rover