ano ko wa kouen de genki ni asonde imasu.

That child is playing energetically in the park.

Breakdown of ano ko wa kouen de genki ni asonde imasu.

• は: topic particle
• で: location particle
• 公園こうえん: park
• 〜て いる: progressive form

Questions & Answers about ano ko wa kouen de genki ni asonde imasu.

How is this sentence read out loud?

A natural reading is:

あのこ は こうえん で げんき に あそんで います。

A few notes:

• 子 here is read こ
• 公園 is こうえん
• 遊んで is あそんで

In normal Japanese writing, you would usually see it without spaces:

あの子は公園で元気に遊んでいます。

What does あの子 mean exactly? Is it literally that child?

Yes, あの子 literally means that child / that kid.

A few nuances:

• あの = that ... over there
• 子 = child / kid, but in real Japanese it can also refer to a young person, not only a small child
• Depending on context, あの子 can mean:
  • that child
  • that kid
  • that boy / that girl
  • sometimes even that person if they are being viewed as young

It does not tell you the gender by itself.

Why is は used after 子 instead of が?