The adverb is never, which modifies the verb "eat."
No parakeets CAN NOT eat spinach !!
The word seldom is an adverb. An adverb of frequency, like often, never, sometime, or always.
Eat spinach. Eat spinach.
It's not. Dogs can eat spinach.
Is spinach eaten by Sandra? No, spinach is eaten by Popeye.
I won't eat spinach and beets for dinner shouted Maurice!
Popeye was known for popping open cans of spinach and eating it.
no
Never is the adverb. It modifies the verb "will forget." It acts the same as the adverb "not."
"Ever" is an adverb.
Yes
Yes, you can.