אנחנו מעמיסים ארגזי קרטון על עגלת המשא.

Yes. Hebrew often omits subject pronouns when the verb already makes the subject clear.

So:

• אנחנו מעמיסים ארגזי קרטון על עגלת המשא.
• מעמיסים ארגזי קרטון על עגלת המשא.

can both mean We are loading cardboard boxes onto the cargo cart.

Including אנחנו adds clarity or emphasis. In a neutral sentence, Hebrew very often drops pronouns more than English does.

מעמיסים is the masculine plural present tense form of the verb להעמיס, meaning to load.

Here it agrees with אנחנו:

• אנחנו מעמיסים = we are loading / we load
  used when the group is all male or mixed-gender

If the group were all female, it would be:

• אנחנו מעמיסות

Hebrew present tense agrees with gender and number, unlike English.

It can mean both, depending on context.

Hebrew present tense does not make the same sharp distinction English does between:

• we load
• we are loading

So אנחנו מעמיסים could mean:

• we load
• we are loading
• sometimes even we’re in the process of loading

The surrounding context tells you which English translation fits best.

Because את is used only before a definite direct object.

Here, ארגזי קרטון means cardboard boxes, not the cardboard boxes, so it is indefinite. Therefore, no את appears.

Compare:

• אנחנו מעמיסים ארגזי קרטון = We are loading cardboard boxes
• אנחנו מעמיסים את ארגזי הקרטון = We are loading the cardboard boxes

So the absence of את is completely normal here.

Because this is a construct chain (called smikhut in Hebrew).

ארגזי קרטון literally means something like boxes of cardboard, which in natural English becomes cardboard boxes.

Here is the pattern:

• ארגז = box / crate
• ארגזים = boxes / crates
• ארגזי ... = boxes/crates of ...

So:

• ארגזי קרטון = cardboard boxes

In the construct form, the first noun changes shape:

• singular: ארגז
• plural absolute: ארגזים
• plural construct: ארגזי

That is why ארגזי קרטון is correct.

In this sentence it is indefinite.

• ארגזי קרטון = cardboard boxes
• ארגזי הקרטון = the cardboard boxes

In a construct chain, definiteness is determined by the last noun.

So:

• ארגזי קרטון → indefinite, because קרטון has no ה
• ארגזי הקרטון → definite, because הקרטון is definite

That is an important Hebrew pattern.

Again, this is a construct chain.

• עגלה = cart
• עגלת ... = cart of ...

So:

• עגלת המשא = the cargo cart / the freight cart

The first noun changes to its construct form:

• עגלה → עגלת

This is especially common with feminine singular nouns ending in ־ה: in construct, they often change to ־ת.

Because in a construct chain, the definite article usually appears on the last noun, not the first.

So:

• עגלת משא = a cargo cart
• עגלת המשא = the cargo cart

Even though the whole phrase is definite, the ה is attached only to משא, the second noun.

This is one of the most important rules of Hebrew construct chains.

משא means load, cargo, or freight, depending on context.

So עגלת המשא is literally something like:

• the cart of the cargo
• more naturally: the cargo cart or the freight cart

It is a formal or standard noun that often appears in combinations like this.

Here על means onto or on(to).

Literally, על often means on or on top of, but with a verb like להעמיס (to load), English usually translates it as onto:

• מעמיסים ... על עגלת המשא = loading ... onto the cargo cart

So although the Hebrew word is the same basic preposition על, the natural English meaning here is directional.

Yes. Hebrew word order is flexible, although the version you have is very natural.

Your sentence:

• אנחנו מעמיסים ארגזי קרטון על עגלת המשא.

Other possible orders might be:

• אנחנו מעמיסים על עגלת המשא ארגזי קרטון.
• ארגזי קרטון אנחנו מעמיסים על עגלת המשא.

These can sound more marked, more literary, or more focused depending on context. The original order is the most straightforward everyday version.

Only the present-tense verb would need to change:

• אנחנו מעמיסות ארגזי קרטון על עגלת המשא.

Everything else can stay the same.

So:

• מעמיסים = masculine plural / mixed group
• מעמיסות = feminine plural

This is because Hebrew present tense agrees with the subject’s gender and number.

אנחנו itself can refer to we in any gender.

It does not change form for masculine vs. feminine. The gender shows up in the verb or adjective connected with it.

So:

• אנחנו מעמיסים = we (male or mixed group) are loading
• אנחנו מעמיסות = we (female group) are loading

The pronoun stays אנחנו either way.

The dictionary form is להעמיס = to load.

It comes from the root ע-מ-ס, which is related to loading or burdening. The form להעמיס / מעמיס belongs to the hif’il verb pattern, which often has a causative sense.

A few useful forms:

• להעמיס = to load
• מעמיס = loading / loads (masculine singular)
• מעמיסה = loading / loads (feminine singular)
• מעמיסים = loading / load (masculine plural)
• העמסתי = I loaded
• אעמיס = I will load

You do not need all of these to understand the sentence, but learners often like seeing how the verb fits into a larger pattern.

It can be either, depending on context.

ארגז often suggests a sturdier box or crate than a very plain קופסה, but in many everyday translations box is perfectly fine.

So ארגזי קרטון is commonly translated as:

• cardboard boxes

Even though word-for-word it is more like cardboard crates/boxes.

Then you would make the direct object definite and add את:

• אנחנו מעמיסים את ארגזי הקרטון על עגלת המשא.

That means:

• We are loading the cardboard boxes onto the cargo cart.

Notice two things:

1. את appears because the direct object is now definite.
2. קרטון becomes הקרטון, which makes the whole construct phrase ארגזי הקרטון definite.