Not only proteins but also vitamin C is "Not only I but also he likes dancing." When I asked whether something like this was correct, I'm sure I remember all native speakers that answered said this was wrong. They all said it's better to say: "Not only does he like dancing, but so do I," "Not only do I like dancing, but so does he." "He likes dancing, and so do I" "I like dancing, and so does he." "He likes dancing as much as I do." "I like dancing as much as he does." So at that time I concluded that "Not only A but also B" can't be a subject. However, today I visited a few websites explaining: "Not only proteins but also vitamin C is essential for small children." (source: https://www.grammarbank.com/not-only-but-also.html) is the way I should write. Can any native speaker please confirm that the above sentence is the way you would say in real life? Thank you in advance! :D

"the person I gave money" Which of the following do native speakers use? 1. "the person I gave money" 2. "the person that I gave money" 3. "the person who(m) I gave money" 4. "the person I gave money to" 5. "the person that I gave money to" 6. "the person who(m) I gave money to" 7. "the person to whom I gave money" Which one(s) should I use? Thank you!

at Christmas Hi ! I know that I should use 'on' before a day, i.e. on Sunday, on Independence Day. But before Christmas, 'at' is used. Are there any other cases where you use a preposition other than 'on' before a day? Thank you. :)

see/meet someone at school Can you say "Let's meet at school."? If so, I know it would mean "I want us to meet inside the school". My question is if it can also mean "in front of the school" as a location to meet up with a friend without intending to go inside the school. Or should it be "Let's meet at 'the' school."? Thanks :D

He was made to fix the car. Hi :) As far as I know, the passive voice of "They made him fix the car." is "He was made to fix the car by them." I wonder whether you can move "by them" in the above sentence and make it "He was made by them to fix the car." Thanks in advance :)