Hi, this is Yuyujin.

Today I introduce “understand” and ” not understand” in Japanese.
Let’s get started.

Basic patterns of “understand” and “not understand” in Japanese are as follows.
A Wa B Ga Wakarimasu(AはBがわかります。)
A Wa B Ga Wakarimasen(AはBがわかりません。)

A Wa B Ga Wakarimasu(AはBがわかります。)

This sentence means
A understands B.

Kare Wa Eigo Ga Wakarimasu
(かれはえいごがわかります。)
He understand English.

Watashi Wa Anatano Kimochi Ga Wakarimasu
(わたしはあなたのきもちがわかります。)
I understand you.
I understand your feeling.

“Kimochi(きもち)” means “feeling” or “emotion”

Akachan Wa Okaasan Ga Wakarimasu
(あかちゃんはおかあさんがわかります。)
The baby understands his mother.
The baby understands who is his mother.

“Akachan(あかちゃん)” means “baby”.
“Okaasan(おかあさん)” means “mother”

A Wa B Ga Wakarimasen(AはBがわかりません。)

This sentence means
Adoesn’t  understand B.

Watashi Wa Kankokugo Ga Wakarimasen
(わたしはかんこくごがわかりません。)
I don’t understand Korean.

Kare Wa Aji Ga Wakarimasen
(かれはあじがわかりません。)
He is not particular about taste.

“Aji(あじ)” means “taste”.

Kanojyo Wa Doitsu No Bunka Ga Wakarimasen
(かのじょはドイツのぶんかがわかりません)
She doesn’t understand German culture.

“Bunka(ぶんか)” means “culture”.

Anata Wa Kono Mondai Ga Wakarimasu Ka
(あなたはこのもんだいがわかりますか。)
Do you understand this question?

Hai Wakarimasu
(はい、わかります。)
Yes, I understand.

Iie Wakarimasen
(いいえ、わかりません。)
No, I don’t understand.

“Mondai(もんだい)” means a question or a problem.

Sore Wa Mondai Desu
(それはもんだいです。)
In this case “Mondai(もんだい)” means “issue”.

OK,that’s it.
Thank you so much.
Have a good trip!