Learn Hardcore Spanish (Latin America): Expreso gratitud a mi familia por su apoyo cada noche. - I express gratitude to my family for their support every night.

Expreso in this sentence is the first-person singular present indicative of the verb expresar (“to express”). It means “I express.” Although expreso can also be a noun in Spanish meaning an “express train” or “espresso coffee,” the context (followed by gratitud) makes it clear it’s the verb form.

Why is there no article before gratitud? Can I say Expreso la gratitud or Expreso mi gratitud instead?

Spanish often omits the article before abstract nouns when speaking generally. Saying Expreso gratitud is perfectly natural. You can also say:

Expreso mi gratitud (I express my gratitude) – adds a personal touch.
Expreso la gratitud is less common and can sound overly formal, as if referring to “that gratitude” in a very defined way.

In a mi familia, why is there a preposition a? Is this the personal “a”?

Here a introduces the indirect object (the recipient of the gratitude): “to my family.” The direct object is gratitud. It’s not the personal “a” marking a direct object of a verb like ver, but rather the standard preposition for “to” when indicating to whom something is expressed.

Why is the phrase por su apoyo used instead of para su apoyo?

Por in this context indicates cause or reason: “because of their support.” If you used para, it would suggest purpose (“in order to get support”), which changes the meaning. So por su apoyo = “for their support” (the reason you express gratitude).

What’s the difference between cada noche and todas las noches? Can they be used interchangeably?

Both can mean “every night,” but:

Cada noche (each night) emphasizes each individual night.
Todas las noches (all the nights) treats them as a group.
In most contexts they’re interchangeable, though cada noche may sound slightly more focused on repetition.

Why is su used in su apoyo? Could it mean “your support” or “his/her support”?

Su is a third-person possessive adjective. Here it refers back to mi familia, so it means “their support.” It does not mean “your” because you haven’t addressed the listener formally or referred to a third party outside the sentence. If context changed, su could mean his/her/your (formal)/their, but here it clearly belongs to “my family.”

Could I replace a mi familia with an indirect-object pronoun? If so, which one is correct?

Yes. The indirect-object pronoun for a singular group (my family) is le:

Le expreso gratitud (a mi familia) por su apoyo cada noche.
You could also hear les in casual speech—Spanish often uses les for collective nouns—but the normative choice is le because familia is singular.

Is Expreso gratitud... a natural phrasing in Latin America, or is there a more common alternative?

It’s perfectly correct but somewhat formal or literal. A more common phrasing is to use the verb agradecer:

Agradezco a mi familia su apoyo cada noche.
This is more idiomatic in everyday speech, though Expreso gratitud… might appear in speeches, letters, or very formal contexts.