Grammatical purpose of replacing the ~る to ~れ and ~ろう, how does this affect the tone of voice?


I am wondering how this informal grammar works.

For example, 頑張る、頑張れ、頑張ろう - they all mean try hard, but how are they different
in the tone of voice? In what situation should I use れ and ろう?

Thank you very much~




**頑張る:** To try your hardest.

**頑張ろう：** Lets try our best

**頑張れ:** (Like an order or a command almost) Try your best

They can be used in any scenario if you use them properly. But in the simplest
use cases:

**私は頑張る:** I will try my best (this is plain form, so its informal. Changing
it to 「頑張ります」makes it polite.

**お互いに頑張ろう：** Lets both try our best (quite informal).

**Malina、頑張れ！！:** Try your best, Malina! (very informal, but its the kind of
thing you shout at your favourite sports players or close friends for
example).

Of course there are many many complexities to this which would require another
question as it's not necessarily specific to「頑張る」.

