Informal:
* പോകാം (pōkām): This is the most common and informal way to say "let's go".
* നമുക്ക് പോകാം (namukk pōkām): This is slightly more formal than "pōkām", and emphasizes that we're going together.
Formal:
* നമുക്ക് പോകേണ്ടതാണ് (namukk pōkaṇṭatāṇ): This is a more formal way to say "let's go" and means "we should go".
* നമുക്ക് പോകാം എന്ന് തോന്നുന്നു (namukk pōkām enn thōnnu): This is a very polite way to say "let's go" and means "I think we should go".
Other options:
* നമുക്ക് പോകാം, നമുക്ക് പോകണം (namukk pōkām, namukk pōkaṇam): This is a more emphatic way to say "let's go" and means "we must go".
* ചെല്ലാം (chellām): This means "let's go" and is used more commonly in the context of traveling to a specific destination.
The best way to choose the right phrase depends on the situation and the people you're talking to.