После tell обязательно нужно указать, кому адресована фраза.
После say адресата нет, если он есть, то требуется предлог "to".
1) People say,"East or west,home is best."
2) Mother often tells me and my sister about her work
3) If you want,I can tell you new fable.
4) My brother said he wanted a new bike.
5) I told my friends about my birthday party.
6) The teacher told the class to open the books.