Learn Hardcore Arabic (Levantine): حملت العفش الخفيف عالشاحنة. - I carried the light furniture onto the truck.

The verb حمل basically means to carry / lift / bear. In a sentence with a truck, English often prefers loaded, so something like loaded the light furniture onto the truck may sound more natural than a very literal carried the light furniture onto the truck.

So the Arabic verb itself is broad; the best English wording depends on context.

Who is doing the action in حملت?

By itself, حملت is ambiguous in normal Arabic spelling.

In Levantine, it can correspond to:

I carried / loaded
you (masculine singular) carried / loaded
she carried / loaded

Usually, the surrounding context tells you which one is meant. Arabic often drops subject pronouns because the verb already gives a lot of that information.

If you wanted to make it explicit, you could add:

أنا = I
إنت = you (masc. singular, in many dialects)
هي = she

Why is there no separate word for I or she in the sentence?