Ama utakula mtindi sasa, ama utaweka tikitimaji ndani ya jokofu hadi jioni.

It is the Swahili way to say either ... or ....

• ama by itself can mean or
• ama X, ama Y gives two alternatives: either X or Y

So the repeated ama is not accidental; it creates a balanced choice between the two actions.

They are very close. Both can mean or.

A simple learner-friendly way to think of them is:

• ama: very common in everyday speech
• au: also correct, sometimes felt as a bit more formal or more neutral in writing

In a pattern like either ... or ..., ama ... ama ... sounds very natural.

Both verbs are in the future tense.

• u- = you (singular)
• -ta- = future marker
• then comes the verb part

So:

• utakula = you will eat
• utaweka = you will put

This is why English will does not appear as a separate word in Swahili; the future meaning is built into the verb itself.

Good question. This is because -la (eat) is a one-syllable verb root, and such roots usually keep an extra ku in many normal finite forms.

So:

• dictionary form: kula
• future: utakula

But with kuweka, the real verb root is longer:

• dictionary form: kuweka
• root used in the verb: -weka
• future: utaweka

So this is not a random difference. -la behaves specially because it is monosyllabic.

It is talking to one person, because of u-.

• u- = you singular
• m- / mta- would be used for you plural

So if you were speaking to more than one person, you would say:

• mtakula
• mtaweka

In Swahili, tense is usually shown inside the verb, not with a separate helper word like English will.

Here the future marker is -ta-:

• u-ta-kula
• u-ta-weka

So Swahili does not need an extra word before the verb.

Because Swahili normally does not use articles like English a/an/the.

That means nouns often appear by themselves:

• mtindi
• tikitimaji
• jokofu

Whether the meaning is a watermelon, the watermelon, or just watermelon depends on context.

Because the object is already stated as a full noun right after the verb: tikitimaji.

So utaweka tikitimaji is perfectly normal:
you will put watermelon / the watermelon

If the watermelon had already been mentioned, Swahili could use an object marker instead of repeating the noun. Since tikitimaji is a class 5 noun, the object marker would be li-:

• utaliweka ndani ya jokofu = you will put it in the fridge

So in your sentence, the full noun is doing the job, and no object marker is necessary.

Yes, you often could.

• ndani ya jokofu = inside the fridge
• jokofuni = in/at the fridge

The version with ndani ya is a little more explicit about being inside the fridge, not just at its location.

Also, ndani ya is a very common structure in Swahili:

• ndani ya nyumba = inside the house
• ndani ya mfuko = inside the bag

So this phrase is very natural.

Yes, sasa can move around somewhat.

In the sentence:

• utakula mtindi sasa

the placement is natural and neutral: the action is stated first, then the time.

But Swahili allows some flexibility, especially with time words. For example:

• sasa utakula mtindi
• utakula sasa mtindi (possible, but less neutral in many contexts)

The original order sounds smooth and ordinary.

Hadi jioni is a time expression meaning until evening.

• hadi = until / up to
• jioni = evening

Yes, in many situations mpaka jioni would also work and mean almost the same thing.

So both of these are natural:

• hadi jioni
• mpaka jioni

Both are commonly treated as class 5 singular nouns.

Their usual plurals are in class 6:

• tikitimaji → matikitimaji
• jokofu → majokofu

This matters because Swahili uses noun classes for agreement in adjectives, pronouns, and object markers.

For example, if you replaced tikitimaji with it, the object marker would be li- because tikitimaji is class 5:

• utaliweka = you will put it

Usually mtindi behaves more like a mass noun, similar to yogurt or milk in English.

That means:

• it often appears without any plural idea
• context tells you whether you mean a serving, some yogurt, or yogurt in general

A plural form is not usually what learners need first here. In this sentence, just think of mtindi as a substance/food item rather than a countable object.