Mtoto akifika nyumbani, mama humkumbatia.

akifika is made of three parts:

• a- = he/she for a singular human noun such as mtoto
• -ki- = if/when
• -fika = arrive

So akifika literally means if/when he or she arrives.

In this sentence, it introduces the time clause: when the child arrives home.

It can mean either if or when, depending on context.

The marker -ki- often covers ideas like:

• if
• when
• whenever

In Mtoto akifika nyumbani, mama humkumbatia, the habitual main verb humkumbatia makes when/whenever the most natural interpretation. The idea is not a one-time event, but a regular pattern.

Both can often be translated as when he/she arrives.

A useful difference is:

• akifika = if/when/whenever he/she arrives
• anapofika = more straightforwardly when he/she arrives

Because this sentence describes a repeated action, akifika works very naturally. It gives a whenever this happens feeling.

So:

• Mtoto akifika nyumbani, mama humkumbatia
  = Whenever the child arrives home, the mother hugs him/her

would sound very natural.

nyumbani comes from nyumba, meaning house/home, plus the locative ending -ni.

So:

• nyumba = house
• nyumbani = at home / to home / in the house, depending on context

Swahili often uses locative forms instead of separate prepositions like to, at, or in.

Here, nyumbani means home or at home. In English we say arrive home or arrive at home, and Swahili expresses that with nyumbani.

humkumbatia can be broken down like this:

• hu- = habitual marker
• m- = him/her object marker
• -kumbatia = hug / embrace

So humkumbatia means usually hugs him/her or hugs him/her habitually.

In this sentence, the object marker m- refers back to mtoto.

hu- marks a habitual or general repeated action.

So mama humkumbatia means something like:

• the mother usually hugs him/her
• the mother hugs him/her whenever this happens

It is not focused on a single event happening right now.

Compare:

• mama anamkumbatia = the mother is hugging him/her or the mother hugs him/her
• mama humkumbatia = the mother habitually/usually hugs him/her

In this sentence, hu- matches the repeated idea created by akifika.

That m- is the object marker. It means him/her and refers to mtoto.

So:

• hukumbatia = usually hugs
• humkumbatia = usually hugs him/her

Swahili often puts the object inside the verb like this.

Because mtoto is a singular human noun, the object marker is m-.

In the habitual form with hu-, Swahili normally does not use the regular subject prefix the way other tenses do.

So in:

• mama humkumbatia

the subject is shown by the noun mama, not by an extra subject prefix inside the verb.

That is why you do not get something like mama ahumkumbatia.

A helpful way to think about it is:

• mama = subject noun
• hu- = habitual marker
• m- = object marker
• -kumbatia = verb root

Swahili generally does not use articles like English a/an and the.

So:

• mtoto can mean a child or the child
• mama can mean a mother, the mother, or simply mother/mum

The exact meaning comes from context.

That is very normal in Swahili, so learners need to get used to understanding definiteness from the situation rather than from separate words.

No. mtoto just means child. It does not tell you the sex of the child.

Also, the agreement markers here:

• a- in akifika
• m- in humkumbatia

do not mean he versus she. They simply agree with a singular human noun.

So the sentence could refer to:

• a boy
• a girl

You only know from context.

mtoto is in noun class 1 in the singular, which is the class for many singular human beings.

Its plural is:

• watoto = children

This matters because the verb agreement changes with the noun class.

Here, because mtoto is singular class 1, you get:

• a- in akifika
• m- as the object marker in humkumbatia

If it were plural, the sentence would change to something like:

• Watoto wakifika nyumbani, mama huwakumbatia.

That means When the children arrive home, mother hugs them.

Notice the changes:

• wa-ki-fika instead of a-ki-fika
• hu-wa-kumbatia instead of hu-m-kumbatia