It is important to understand the importance of health.

His explanation was impossible to understand.

He learned the past tense in Japanese.

Please check the archives of the BBS.

Learning how to use past participles is important for understanding English.

He told the story using the past tense.

My room is on the second floor, and your room is above mine.

I had a picnic at Ueno Park.

We should consider this problem from the standpoint of students.

Mr. Ue is my best friend.