A bayan makaranta akwai filin wasa.

Here, bayan means behind or at the back of.
A useful thing to know is that bayan can also mean after in other contexts. So learners often meet both meanings.

In this sentence:

• a bayan makaranta = behind the school

Because it is used with a and a place noun, the meaning is clearly spatial, not temporal.

Because the structure points to location, not time.

• a bayan makaranta = behind the school
• bayan makaranta on its own can sometimes mean after school, depending on context

So the little word a matters a lot here. It helps make the phrase clearly locative.

Akwai is the usual Hausa word for there is or there are in an existential sense.

So:

• akwai filin wasa = there is a playground / there is a playing field

A helpful point: akwai does not change for singular and plural the way English changes from there is to there are. The same word is used for both.

Hausa normally does not use articles the way English does. There is no direct everyday equivalent of English the or a/an in many sentences.

So makaranta can mean:

• a school
• the school

The exact meaning is usually understood from context.

Filin wasa literally means something like field of play or playing field.

It is made up of:

• fili = field, open space
• wasa = play, game

So in natural English, filin wasa can be translated as:

• playground
• sports field
• playing field

The best translation depends on context.

This is because Hausa often uses a linking form when one noun is connected to another noun.

So:

• fili = field
• filin wasa = field of play

The -n is a linker joining the first noun to the second. English often uses of for this kind of relationship, but Hausa often uses this attached linking form instead.

Hausa can put the place expression first very naturally.

So:

• A bayan makaranta akwai filin wasa
  literally follows the pattern Behind the school, there is a playground

This is a normal Hausa way to present the information. It sets the location first and then tells you what exists there.

You can also hear:

• Akwai filin wasa a bayan makaranta

That version is also natural. The difference is mostly one of focus or information order, not basic meaning.

Yes. Akwai works with both singular and plural.

For example:

• Akwai filin wasa = There is a playground
• Akwai filayen wasa = There are playgrounds / playing fields

So unlike English, Hausa does not switch from there is to there are here.

A rough English-friendly pronunciation would be:

ah BAH-yan ma-ka-RAN-ta ah-KWAI FEE-lin WAH-sa

A few quick notes:

• bayan sounds roughly like BAH-yan
• akwai ends with a sound like eye
• filin sounds roughly like FEE-lin
• wasa sounds roughly like WAH-sa

Hausa spelling is fairly consistent, so pronunciation is often more straightforward than English spelling.