either vs neither

[Huda2]

hi,

"It is not very cold. I don't think we need these big jackets." "I don't think so, _____."

anyway
neither
either
too

it is used either.
why?

thanks

[Milanya]

"Either" is used in negative sentences to add an agreeing thought.
Examples:

Jane doesn't speak French. Sam doesn't speak French either.
I don't love chocolate. I don't love pizza either.
Frank cannot come with us. Nancy cannot come with us either.
PLACEMENT
"Either" usually comes at the end of a clause.

"Too" is used in positive sentences to add an agreeing thought. It has the same meaning as "also," but its placement within the sentence is different.

Examples:

Jane speaks French. Sam speaks French too.
I love chocolate. I love pizza too.
Frank can come with us. Nancy can come with us too.

Your sentence is negative ("I don't think so, _____.)"
, so you have to use "either."
_________________
con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[Huda2]

many thanks, now I have idea