必須 biˋ xuˉ

(Had to, Has to, Have to, Having to, Must, Need, Obligatory, Require, Required, Requires, Requiring, To have to, To require)

Must, Need, To require, To have to (be), Require, Requires, Requiring, Required, Have to, Has to, Having to, Had to, Obligatory

是 shiˋ

(Am, Are, Being, Is, To be, Was, Were, Yes)

Is, To be, Am/Are/Is/Was/Were, Being, Yes

必

Certainly, Must, Necessary, Will

Must, Certainly, Necessary, Will

須

Beard, Have, Must, Mustache, Short moment, Whiskers

Must, Have, Short moment, Beard, Mustache, Whiskers

是

Am, Are, Being, Is, To be, Was, Were, Yes

Is, To be, Am/Are/Is/Was/Were, Being, Yes