in need of 与in want of的区别 celebrate与 congratulate的区别

1 in need of 与in want of 在语法和使用上没有区别：
The house is in need / want of repair.
2 celebrate-----强调举行活动来庆祝某件事
3 congratulate----通常口头上祝贺几句,没有其他表示.