Recibo ayuda de mi profesora cuando no comprendo una palabra difícil.

Recibo is the first-person singular form of recibir in the present indicative.

So:

• recibir = to receive
• recibo = I receive / I get

In this sentence, it expresses a usual or repeated action: I get help...

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

• recibo already means I receive
• so yo is not necessary

You could say Yo recibo ayuda..., but it would usually add emphasis or contrast, for example:

• Yo recibo ayuda, pero él no.
  I get help, but he doesn’t.

Without that contrast, dropping yo is more natural.

Because recibo here describes a habitual or general action: something that happens whenever the situation comes up.

• Recibo ayuda... = I get help... / I receive help...
• Estoy recibiendo ayuda... = I am receiving help... right now

So the original sentence means this is the normal pattern, not just something happening at this exact moment.

Because de shows the source of the help: the help comes from the teacher.

• ayuda de mi profesora = help from my teacher

Using por here would not sound natural in standard Spanish for this meaning.

A useful way to remember it:

• de = from
• por = by, through, because of, for, depending on context

So if you want to say who the help comes from, de is the right choice.

Yes. Mi profesora me ayuda is completely correct and very natural.

The difference is mainly one of focus:

• Recibo ayuda de mi profesora focuses on you receiving help
• Mi profesora me ayuda focuses on your teacher helping you

Both can translate naturally as My teacher helps me / I get help from my teacher, depending on context.

In Spain, profesor/profesora is commonly used for a teacher, especially in school or secondary education, and also for some instructors.

So mi profesora usually means my teacher here.

Because it ends in -a, profesora is feminine, so the teacher is female:

• profesor = male teacher
• profesora = female teacher

Yes. In most everyday contexts, entender and comprender both mean to understand and can often be exchanged.

So you could say:

• cuando no entiendo una palabra difícil

That would sound very natural too.

A small nuance some speakers feel is:

• entender = more common in everyday speech
• comprender = sometimes slightly more formal or slightly deeper

But in this sentence, both work well.

Because cuando here means whenever, not just if.

• cuando no comprendo una palabra difícil = when/whenever I don’t understand a difficult word

This suggests a repeated situation: every time that happens, the speaker gets help.

If you said si no comprendo..., it would sound more like a condition:

• if I don’t understand...

That is possible in some contexts, but cuando fits better for a usual routine.

Because the sentence describes a general habit or a regular situation.

• Recibo = I get
• no comprendo = I don’t understand

Spanish often uses the present tense for things that happen regularly, just like English does:

• I get help when I don’t understand a difficult word.

It is not talking about one single moment only.

Because ayuda is being used as an uncountable/abstract noun here, in a general sense.

• Recibo ayuda = I get help

That is natural in Spanish, just as I get help is natural in English.

If you said Recibo la ayuda, it would mean I receive the help, referring to some specific help already known in the conversation.

Because una means a or any one, so the sentence is talking about any difficult word, not one specific word already identified.

• una palabra difícil = a difficult word
• la palabra difícil = the difficult word

If you had already mentioned a particular word, then la could make sense. But in the original sentence, the meaning is general.

In Spanish, descriptive adjectives often come after the noun.

So:

• una palabra difícil = a difficult word

This is the normal word order.

Putting difícil before the noun would sound unusual here. In Spanish, adjective position can sometimes change emphasis or style, but palabra difícil is the standard, natural order.

No. There are other possibilities, but the original is very natural.

For example:

• una palabra complicada = a complicated word
• una palabra que no entiendo = a word that I don’t understand

Still, una palabra difícil is simple, correct, and common.

Yes, it does. Recibir ayuda is a normal and correct expression.

It can sound a little more neutral or formal than some alternatives, but it is not strange.

Other natural ways to express a similar idea are:

• Mi profesora me ayuda...
• Pido ayuda a mi profesora... = I ask my teacher for help...
• Mi profesora me echa una mano... = My teacher gives me a hand...
  (more informal)

So recibo ayuda is perfectly good Spanish.

Yes, but the original order is the most straightforward and neutral.

Original:

• Recibo ayuda de mi profesora cuando no comprendo una palabra difícil.

You could also say:

• Cuando no comprendo una palabra difícil, recibo ayuda de mi profesora.

This version puts the time clause first: When I don’t understand a difficult word, I get help from my teacher.

Both are correct. The difference is mainly in emphasis and rhythm, not basic meaning.