Did either of the sisters bring her umbrella?
Either is singular.
WHOMEVER the seniors elect will as the president of the class.
WHOEVER the seniors elect will serve as the president of the class.
The answer is whomever, it just sounds better and more proper than whoever. Hope this helps!
Explanation:

if this helps you then please make me brainlist
Answer:
Your vocabulary notebook can be used to practice the meaning of new words everyday. When you find words, you can add them in your notebook, write the definition, and the synonyms/antonyms. Let's just say you want to revisit a word because you didn't know its meaning. You then would turn to the page in your notebook and review it.
1. Try to figure out the definition by looking at its prefixes and suffixes.
2. Write the words from a textbook's glossary, and write it down in the notebook.
3. You write synonyms and the antonyms for each of your words.