1) Either.....or.... / Neither......nor .....
The second noun determines the verb.
Neither Amelia nor her friends like durians.
Neither Jayne nor Naomi has a mobile phone.
Sometimes the sentence may be in the past tense:
Neither James nor Peter watched the match.
(In this case, it does not matter if the noun is singular or plural.)
2) Main subject
Remember that the clause between commas provides extra information. The main subject determines the verb.
Nick, as well as Matthew, is good in badminton.
Chris, together with his brothers, walks to school every day.
3) who / whom
Both of these are relative pronouns used to refer to people
who - followed by a verb
whom - followed by a noun / pronoun
exception: to whom - followed by a verb
The lady who waved at me is a famous actress.
The boy whom I spoke to was my best friend.
To whom does this file belong?
Colon - used to introduce a list
E.g. These are some of my favourite books: Leota's Garden, Anne in Green Gables, Someone Else's Kids and Toto Chan.
Semicolon - used to separate two closely related independent clauses
E.g. Samantha was the only prefect around ; she had to settle the matter.
Note: There are many other usages of the colons and semicolons. If you are interested, take a look at