1be sure to
2be through
3be through with
4be tired of
5be tied up
6be up all night
7be up to sb.
8be up to sth./doing sth
9be used to
10be way behind in
11be willing to
12be worried about
13be worth sth./doing sth
1be/get tied up
2be/go on a diet
3bear up well
4because of
5before long
6begin one's diet
7behind the time
8believe it or not
9belong to
10below zero
11benefit concert