sentence structure

Let's begin with the basics: sentence structure.
toki pona, like most other languages, have 3 main blocks to its sentences: the subject, the verb and the object.
In basic terms, the subject is the main thing which the sentence is about. The verb is the action the subject does and the object is what the action is done to (if the verb needs an object); together, the verb and the object form the predicate.

Let's do an example in English: "a person ate a pear."

a person (subject) eating (verb) an apple (object)

A person is doing the eating, so they are the subject;
the action is eating so that's the verb;
and the pear is what's being eaten, so it's the object!

A person ate a pear.

In English, the form and order of words indicates which is subject, verb or object. English does them in that order, SVO.
toki pona also uses SVO as its word order, but just that isn't enough to differentiate them. For that, toki pona uses particles to indicate where one block ends and another begins:

li
li
[start of predicate]
e
e
[start of object]

Let's translate the English example into toki pona. Using the particles, "A person ate a pear" loosely becomes:

jan (subject) li moku (verb) e kili (object)
jan li moku e kili
jan li moku e kili
person eats fruit
soweli li musi
soweli li musi
animal is fun/playing

If the subject is mi or sina, however, the particle is dropped:

person (subject) listening (verb) to someone (object)
sina kute e mi
sina kute e mi
you listen to me

If the sentence is an order (imperative mood) or a request (optative mood), or you want to adress someone (vocative case), then li becomes another particle, o:

o
o
[start of predicate | imperative/optative/vocative]
two people and a speech bubble ordering them to respect/love each other
jan o olin
jan o olin
people must love/respect
jan Atu o
jan [a tu] o
(Hey) Arthur!

If the subject is sina, it can be dropped:

o moku e kili
o moku e kili
(you) eat fruit!

If you want to have multiple subjects, predicates or objects, you must repeat the particle that indicates it. For subjects there is another particle:

en
en
[start of new subject]
soweli li suwi li musi


soweli li suwi li musi
animals are cute and fun
mi pali e ilo e lipu


mi pali e ilo e lipu
I make tools and books
moku en musi en pali li pona


moku en musi en pali li pona
eating, playing and working are good

However, ambiguity can happen with multiple subjects/predicates/objects that can be avoided with better phrasing:

ona li moku li pana e kili e kalama


ona li moku li pana e kili e kalama
they eat and give fruit and noises
ona li moku e kili li pana e kalama


ona li moku e kili li pana e kalama
they eat fruit and give noises