kaname ishidesu
1. It is a key stone.; It is important.
Noun
#147458
1. It is a key stone.; It is important.
1. keystone
1. Key stone; Foundation stone
1. It is not a stepping stone.; It is not important.
1. Wasn't a key stone.; Wasn't important.
1. Wasn't a key stone.; Wasn't important.
1. It was a key stone.; It was important.
1. It was not a stepping stone.; It wasn't a key stone.
1. If it were a key stone.; If it's a key stone.
1. It is not a stepping stone.; It's not essential.