both和not搭配,一般是部分否定,neither才是完全否定,两者都不,例如:Both of the sentences aren't correct.Both of my students didn't get an A.但是如果both放在了be动词、助动词之后,一般动词之前,或者主语之后,作了同位语,则both not表示完全否定,如They both didn't get an A.希望我能帮助你解疑释惑。