Yes we all can leave at six./ We can also make it at 6.
We are planning to leave at six too./ We can leave at six too.
例えば、
6時ぐらいに着くと思うー
'I think I will arrive/ get there around 6.'
7時に品川に着いたところだー
'I just got into Shinagawa station.'
今夜何時までにパーティーに着くのでしょうか？－
'What time are you going to make it tonight for the party?'
以上は私がよく使う表現になりますが、どうぞご参考までに。
インド 
