Learn Hardcore Swahili: Kabla ya sherehe, tutapokea tangazo la mwisho kutoka kwa mwalimu. - Before the celebration, we will receive the final announcement from the teacher.

Kabla means “before.” When it’s followed by a noun, you need a genitive/linking particle that agrees with that noun’s class. Sherehe (“ceremony”) is class 9, so its linker is ya.
Together: Kabla ya sherehe = “Before the ceremony.”

How is the future tense formed in tutapokea?

Tutapokea =
• tu- (subject marker “we”)
• -ta- (future tense marker)
• -pokea (verb root “receive”)
So tu- + -ta- + -pokea → tutapokea = “we will receive.”

Why is it tangazo la mwisho and not tangazo ya mwisho?

Tangazo (“announcement”) belongs to noun class 5 in singular. Class 5’s genitive/linker is la. Mwisho is an adjective (“final/last”), so you link them with la:
tangazo la mwisho = “final announcement.”
(If it were plural class 6 it would be matangazo ya mwisho.)

What does kutoka kwa mean, and why do we need kwa before mwalimu?

Kutoka means “to come from” or “from.” When the origin is a person, you must insert kwa before the person’s name/job:
kutoka kwa mwalimu = “from the teacher.”
Omitting kwa here would be ungrammatical.

Why does tutapokea come before tangazo la mwisho and kutoka kwa mwalimu?

Standard Swahili word order is:
1) Verb (with subject+tense)
2) Object
3) Adverbials or prepositional phrases
Hence: tutapokea (v) → tangazo la mwisho (object) → kutoka kwa mwalimu (prep. phrase).

Could mwisho function as a noun rather than an adjective here?

Yes. Alone, mwisho = “end” (noun), e.g. mwisho wa sherehe = “the end of the ceremony.” In tangazo la mwisho, mwisho is linked by la and describes tangazo, so it’s used adjectivally as “final.”

Can we omit the linker (ya/wa/la) after Kabla or after tangazo and say Kabla sherehe or tangazo mwisho?

No. Swahili requires the correct genitive/linking particle between two nouns or between a noun and its adjective. The linker must match the first noun’s class. Omitting it makes the phrase ungrammatical.