Baada ya kuvuna, mavuno huwekwa kwenye magunia makubwa nyuma ya nyumba.

Baada ya means after. After this expression, Swahili commonly uses the infinitive form of a verb, which begins with ku-.

So:

• kuvuna = to harvest
• baada ya kuvuna = after harvesting

This is a very common pattern in Swahili:

• baada ya kula = after eating
• baada ya kusoma = after studying

They come from the same root idea, but they are different kinds of words:

• kuvuna = the verb to harvest
• mavuno = the noun harvest, yield, or harvested produce

So in this sentence:

• baada ya kuvuna = after harvesting
• mavuno = the harvest / the crops that have been harvested

Swahili noun classes do not always match English singular and plural in a one-to-one way.

Mavuno is a class 6 noun and often has a collective meaning. It can refer to the harvested produce as a whole, even if English translates it with a singular word like harvest.

So although mavuno looks plural in form, the meaning in English may be:

• the harvest
• the harvested crops
• the yield

depending on context.

Huwekwa means are usually put, are placed, or are stored.

It comes from the verb kuweka, which means to put, to place, or to set.

Breakdown:

• kuweka = to put / place
• kuwekwa = to be put / to be placed
• huwekwa = are usually put / are customarily placed

So the sentence is describing a normal practice or general procedure, not just one single event.

Hu- often gives a habitual, customary, or general truth meaning.

So huwekwa does not just mean are put in a one-time sense. It means something more like:

• are usually put
• are normally placed
• are typically stored

In this sentence, it suggests a routine that happens after harvesting.

The passive is used because the sentence focuses on the harvest, not on the people doing the action.

So instead of saying:

• People put the harvest into large sacks...

Swahili says:

• The harvest is put into large sacks...

This is very natural in Swahili, especially when the doer is obvious, unimportant, or not being emphasized.

Kwenye is a locative word. Depending on context, it can mean:

• in
• on
• at
• to

Here, because magunia means sacks, the most natural translation is:

• in large sacks
• sometimes into large sacks

So kwenye magunia makubwa means in/into large sacks.

There are two things happening here:

1. Plural noun

   • gunia = sack
   • magunia = sacks

2. Adjective agreement

   • kubwa = big / large
   • makubwa = big / large, agreeing with a class 6 plural noun like magunia

Also, in Swahili, adjectives usually come after the noun.

So:

• gunia kubwa = a large sack
• magunia makubwa = large sacks

That is why magunia makubwa is correct.

Nyuma means back or behind.

So:

• nyuma ya nyumba literally means the back of the house
• idiomatically, it means behind the house

The ya is a connector often translated loosely as of in this kind of structure.

You will see this pattern in many place expressions:

• mbele ya nyumba = in front of the house
• ndani ya nyumba = inside the house
• karibu na nyumba = near the house

The comma is helpful, but it is not the most important part of the sentence grammatically.

It separates the introductory time phrase:

• Baada ya kuvuna = after harvesting

from the main clause:

• mavuno huwekwa kwenye magunia makubwa nyuma ya nyumba

So the comma makes the sentence easier to read, much like in English after an opening phrase. In many contexts, Swahili punctuation follows similar readability rules.