Grammar — Paired Conjunctions

"Both my mother and my sister are here."

ما القاعدة النحوية مع both...and؟ ولماذا الفعل جمع؟

"Not only my mother but also my sister is here. / Not only my sister but also my parents are here."

كيف يتحدد الفعل مع not only...but also؟ وما القاعدة؟

"Neither my mother nor my sister is here. / Neither my sister nor my parents are here."

ما القاعدة مع neither...nor؟ وكيف يتحدد الفعل؟

"I'll take either chemistry or physics next quarter."

ما وظيفة either...or؟ وكيف يختلف عن both...and؟

"That book is neither interesting nor accurate."

ما وظيفة neither...nor مع الصفات؟ وكيف يختلف عن not...or؟