Mwalimu amesema niweke sahihi yangu kwenye fomu hii.

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

So mwalimu can mean:

• the teacher
• a teacher

The context tells you which one is intended. In this sentence, English usually translates it as the teacher.

Amesema breaks down like this:

• a- = he/she
• -me- = perfect aspect
• -sema = say

So amesema literally means he/she has said.

In natural English, depending on context, it may be translated as:

• has said
• said
• sometimes even has told me if that is the intended sense of the whole sentence

Because the sentence is reporting what the teacher wants or instructs the speaker to do.

Niweke is a subjunctive form, and Swahili often uses the subjunctive after verbs like say, tell, want, ask, or instruct, when the meaning is something like:

• that I should put
• that I put
• for me to put

So amesema niweke is basically has said that I should put.

Niweke comes from kuweka, meaning to put / place.

It breaks down like this:

• ni- = I
• wek- = put/place
• -e = subjunctive ending

So niweke means something like:

• that I put
• I should put
• let me put

In this sentence, I should put is the best fit.

Because ninaweka is a normal indicative form meaning I am putting or I put.

But here the speaker is not describing an action already happening. The sentence is expressing an instruction or expectation after amesema. That is why Swahili uses the subjunctive niweke, not the regular indicative ninaweka.

Compare:

• ninaweka sahihi yangu = I am putting my signature
• amesema niweke sahihi yangu = he/she said I should put my signature

Yes, sahihi can mean correct/right, but in this sentence it means signature.

Swahili has many words whose meaning depends on context. Here, because it is followed by yangu and connected with a form, sahihi yangu kwenye fomu hii, it clearly means my signature.

So in this sentence:

• sahihi = signature

In Swahili, possessives usually come after the noun, not before it.

So:

• sahihi yangu = my signature
• literally = signature my

That word order is normal in Swahili.

Also, the possessive agrees with the noun class of the noun. Sahihi belongs to a class that uses possessive forms like:

• yangu = my
• yako = your
• yake = his/her

Kwenye is a location word that can often mean:

• on
• in
• at
• sometimes to/onto, depending on context

English uses several different prepositions where Swahili may use just one form.

In kwenye fomu hii, the most natural English translation is on this form.

So:

• kwenye fomu hii = on this form

In Swahili, demonstratives like this usually come after the noun.

So:

• fomu hii = this form
• literally = form this

That is normal Swahili word order.

Also, hii agrees with the noun class of fomu.

Because fomu is treated as a noun in the class that takes demonstratives like hii for the singular.

So:

• fomu hii = this form
• fomu hizi = these forms

This is common with many loanwords in Swahili.

In English, you often say The teacher said that I should...

In Swahili, a separate word for that is often not necessary. The structure can go straight from amesema to the subjunctive clause:

• amesema niweke...

You can sometimes add kwamba in some sentences, but it is not required here. The sentence is natural without it.

Yes. Swahili can express this idea in more than one way.

This sentence uses a literal structure:

• kuweka sahihi = to put a signature

You may also hear:

• kusaini fomu hii = to sign this form

Both are understandable. The given sentence is perfectly natural and emphasizes putting my signature on this form.