Must I/Do I have to go home?

Am feum mi a dhol dhachaigh?

To say we 'need to' do something, we can use the verb feum (have to/need to/must) in the same way we use faod (may, /might). Again, this verb only has future and conditional tenses. We can see below  two forms of the future tense, feumaidh and feum :

Am feum?
Have to/need to/must?
Nach fheum?
Haven't to/needn't/mustn't?
Feumaidh
Have to/need to/must …
Chan fheum
Doesn't/needn't/mustn't' …
Am feum i tighinn a-steach?
Does she have to come in?
Chan fheum! Chan fheum i tighinn a-steach
She needn't. She need not/doesn't need to come in.
Nach fheum sinn falbh a-nis?
Don't we have to go now?
Feumaidh. Feumaidh sibh falbh a-nis.
You do. You have to go now.
Am feum mi a dhol dhachaigh?
Do I have to go home?
Feumaidh. Feumaidh tu a dhol dhachaigh.
You do. You have to go home.