Gajiya ita ce sanadin kuskuren.

Ita ce is the part that makes the sentence mean is in English.

In Hausa, sentences like X is Y often use a pronoun plus ne/ce instead of a separate present-tense verb to be. So:

• Gajiya ita ce sanadin kuskuren

is literally close to:

• Fatigue, it is the cause of the mistake

but in natural English we simply say:

• Fatigue is the cause of the mistake

Because gajiya is grammatically feminine in Hausa.

Hausa nouns belong to grammatical gender classes, and that affects agreement. Since gajiya is feminine, the matching form is:

• ita rather than shi
• ce rather than ne

So the sentence uses feminine agreement with gajiya.

Here it agrees with gajiya, the noun being identified.

That can confuse learners, because sanadi is the predicate noun (cause/reason), but the ita ce part is tied to gajiya. So the sentence is structured around:

• Gajiya → feminine
• therefore ita ce

A useful breakdown is:

• sanadi = cause, reason
• sanadin = cause of ...
• kuskure = mistake, error
• kuskuren = the mistake / the error

So:

• sanadin kuskuren = the cause of the mistake

They both end in -n, but the -n is not doing exactly the same job in both words.

• In sanadin, the -n is a linker/construct form showing that another noun follows: cause of ...
• In kuskuren, the -n marks definiteness, giving the sense the mistake

So even though the endings look the same, their functions are different here.

Because Hausa often marks definiteness with an ending, not with a separate word like English the.

So:

• kuskure = a mistake / mistake
• kuskuren = the mistake

That final -n gives the definite meaning.

It is singular and definite.

So it means:

• the mistake
• the error

not mistakes in general.

A very literal rendering would be:

• Fatigue, it is the cause of the mistake

That sounds awkward in English, but it helps show the Hausa structure:

• Gajiya = fatigue
• ita ce = it is
• sanadin kuskuren = the cause of the mistake

Natural English then becomes:

• Fatigue is the cause of the mistake

It can often mean both cause and reason, depending on context.

So this sentence could be understood as:

• Fatigue is the cause of the mistake
• Fatigue is the reason for the mistake

In this sentence, cause is a very good translation, but reason is also close in meaning.

Because gajiya is being used here as a general or abstract noun: fatigue.

Abstract nouns in Hausa, as in English, often appear without an explicit the when they are used in a general sense. Compare English:

• Fatigue caused the problem
• not necessarily The fatigue caused the problem

So the bare form gajiya works naturally here.