This planet has life signs, if you like that sort of thing.

The USS Keystone doesn't have the sort of scanner that can detect those from orbit, as those haven't been invented yet. Still, that sure looks like vegetation. Perhaps there's radio chatter or some other form of electronic communication? Those they can detect. Usually.

No radio, but it does look floral down there! Distinct orangey tint to the organisms, overall, sort of a coral-y-salmon-y orange, though many individual spots are heavier on the pink or the yellow or even green.

Well, than a team can be sent down to investigate, starting at a greener looking area. Hopefully it will at least be a place for the crew to stretch their legs.

The voyage was going about as well as Lia could have imagined. Sure, they were stranded, but they were stranded in space, with alien planets and new stars and who knows how many people to meet and unchartered regions to discover. It'd be great to get back home of course, but maybe not right this minute. 

The air is safe to breathe! None of the wildlife is obviously out to kill them right now! Most of the plants are more like mushrooms, but they're big and colorful and alive and smell kind of nice actually.

Lia resists the urge to start running for all of twenty seconds - it is not a very large ship she's been cooped up on.

While her superior officer runs around possibly Petra can detect life signs now that they're actually in range to do that.

The mushrooms are alive! The plants are too except that one which is dead! There are animals! What kinds of fine-grained information can her detection turn up?

The shuttle's short range scanner can distinguish between plants, animals, and humanoids within a radius of half a mile. 

Humanoids! Over there!

Well then, once Lia has returned from sprinting in the opposite direction they can go and introduce themselves to the humanoids.

The humanoids have a humble hamlet built of dried out mushroom slices. They are eating skewered fish whole. They are very surprised to see human(oids).

"Hello!"

They consider this utterance for a while, and then reply:

"[UNGODLY SHRIEK]"

Petra can start going through the basics of gesturing to herself and then the new humanoids and so on until she has enough to construct the basics of the grammar, entering information into her data pad as she goes. The speaker embedded in her badge can pronounce the words for her. She could possibly do that bit herself too but she has no desire to attempt to do so. 

The natives are willing and able to repeat her phonemes! "Peh-ta. Tra. Peh-tra." They seem to find this more interesting than talking to her in their own language, actually.

Petra can teach them some English as she goes but she doesn't expect they'll be as fast at learning English as she is at learning their language.

Is she sure?

Yes.

Well, they talk to each other some, but they want to know the English words for everything and they want it right now please and thank you. They will take instruction in parallel from other crew members too!

Which Lia is happy to provide!

"Hhhyuuumens! Hyuumens and" [horrible squawking that means the natives] same place after different place???"

"We humans traveled here from our place to this place!"

 We'll mostly humans, there are are one or two non-humans, and one mostly human. But that's probably not helpful for people learning the language.

Petra can try at her best translation of what Lia said.