一緒に行きませんか Why don't we all go together?

To invite someone to do something, change the "masu" of the verb's MASU-form to "masen ka" and raise the intonation. "Masen" is a negative form, but with "masen ka," it becomes an invitation. To accept the invitation, say "ii desu ne" or "sounds good."

"-masen ka" and "-mashoo":　　
"-mashoo" is also an expression of invitation, but it has the nuance of encouraging the person to accept. On the other hand, "-masen ka" is used when you want to check the other person’s availability, so it's more polite.

Try inviting someone to do something together

1Which of these three choices is the correct way to say this sentence in Japanese?

Why don't we have a barbecue with everyone?　

have a barbecue with everyone

みんなでバーベキューをする（→します）

minna de baabekyuu o suru (→shimasu)

2Say the sentence in Japanese, using the following word(s).

Why don't we XXX?

～ませんか。

～masen ka.

sing together

一緒に歌う（→歌います）

issho ni utau (→utaimasu)

3Say the sentence in Japanese, using the following word(s).

Why don't we XXX?

～ませんか。

～masen ka.

try doing

やってみる（→やってみます）

yatte miru (→yatte mimasu)

This expression is used to decline an invitation. "Chotto" means "a little." However, stretching out the ending and weakening the pitch creates the nuance that you’re reluctantly declining.

Ninja (ninja)