是非

ぜひ

是否

[zehi]

Meanings

1.Adverb

certainly; without fail

2.Noun

right and wrong; pros and cons

楽しかったので是非また来てください。

It was fun, so please come again.

事の是非をよく考えて決めよう。

Let's decide after carefully considering the pros and cons.

是非参加したいと思います。

I definitely want to participate.