Die fout is menslik.

Die is the definite article, so here it means the.

A useful thing for English speakers to know is that Afrikaans does not have different words for the based on grammatical gender. In many cases, you can just use die for the:

• die fout = the mistake / the error
• die man = the man
• die vrou = the woman

So in this sentence, die fout is simply the mistake or the error.

Fout usually means mistake, error, or fault, depending on context.

For example:

• ’n fout maak = to make a mistake
• ’n rekenaarfout = a computer error
• Dit is my fout = It is my fault

So fout is a flexible word, much like error/mistake/fault in English.

Because menslik comes after the verb is, and in Afrikaans adjectives used this way usually do not take -e.

Compare:

• Die fout is menslik. = adjective after is → menslik
• die menslike fout = adjective before the noun → menslike

This is a very common pattern in Afrikaans:

• Die kind is klein.

• die klein kind

• Die storie is interessant.
• die interessante storie

So menslik is correct here because it is the predicate adjective.

No. This is a very straightforward Afrikaans sentence with the same basic structure as English:

• Die fout = subject
• is = verb
• menslik = complement/adjective

So it works like:

• The mistake is human.

This kind of sentence is one of the simplest sentence patterns in Afrikaans: subject + is + adjective.

Yes, very closely. Is is the present-tense form of wees (to be).

Examples:

• Hy is moeg. = He is tired.
• Sy is hier. = She is here.
• Die fout is menslik.

Afrikaans verbs usually change much less than English verbs, so is is used regardless of whether the subject is singular or plural:

• Die fout is menslik.
• Die foute is menslik.

Not really. Die fout is menslik is grammatical, but it sounds more literal and less idiomatic than the English saying.

If you want the idea To err is human, more natural Afrikaans would be:

• Dit is menslik om foute te maak.
• Om foute te maak is menslik.

The given sentence sounds more like The mistake/error is human, which is understandable but not the usual fixed expression.

You would normally say menslike fout.

That is a noun phrase:

• menslike fout = human error

But Die fout is menslik is a full sentence:

• The error is human

So the difference is:

• menslike fout = adjective before the noun
• Die fout is menslik = adjective after is

This is an important distinction in Afrikaans grammar.

You change fout to foute:

• Die foute is menslik. = The mistakes are human.

Notice that is stays is. Afrikaans does not change the verb the way English changes is/are.

So:

• singular: Die fout is menslik.
• plural: Die foute is menslik.

Afrikaans normally uses a double negative with nie ... nie.

So:

• Die fout is menslik.
• Die fout is nie menslik nie.

That final nie is very important in standard Afrikaans. English speakers often forget it at first.

In a yes/no question, Afrikaans usually puts the verb first:

• Is die fout menslik?

That is the direct question form of:

• Die fout is menslik.

This is similar to English Is the mistake human?, although Afrikaans question formation is often even more regular than English.