La profesora dice que mi ortografía mejora, pero todavía pongo mal alguna coma cuando escribo deprisa.

In Spanish, you normally use an article with a profession or role when it is the subject of the sentence and refers to a specific person.

So la profesora dice... is the natural way to say the teacher says...

Just profesora by itself would usually sound incomplete unless you are directly addressing her:

Profesora, tengo una duda. = Teacher, I have a question.

You could also say mi profesora dice... if you want to say my teacher says...

Because decir que here simply reports information: the teacher says that my spelling is improving. After this kind of statement, Spanish normally uses the indicative, not the subjunctive.

So:

La profesora dice que mi ortografía mejora.
= She says that my spelling is improving.

The subjunctive would be used if decir meant something more like to tell someone to do something:

La profesora dice que ponga más atención.
= The teacher tells me to pay more attention.

So in your sentence, mejora is correct because it is being presented as a fact or opinion, not as a command.

Both are possible, but they are slightly different in feel.

Mi ortografía mejora is a very natural Spanish way to express a general ongoing improvement. Spanish often uses the simple present where English might prefer is improving.

Mi ortografía está mejorando is also correct, but it puts more focus on the process happening right now.

Very roughly:

• mejora = is improving / improves
• está mejorando = is in the process of improving

In everyday Spanish, the simple present is often the more natural choice.

Ortografía means spelling or, more broadly, orthography.

In this sentence, mi ortografía means my spelling.

It is not the same as escritura:

• ortografía = spelling, correct use of letters and written forms
• escritura = writing, handwriting, or the act/style of writing

So if the teacher is talking about correct spelling, ortografía is the right word.

Here todavía means still.

So pero todavía pongo mal... means but I still put/place ... wrongly

Yes, in this context todavía and aún usually mean the same thing:

• Todavía cometo errores.
• Aún cometo errores.

Both mean I still make mistakes.

In modern everyday speech, todavía is very common. Aún is also common, but can sound a little shorter or slightly more formal depending on context.

Yes. Spanish often uses poner for punctuation, meaning to put or to place a punctuation mark.

So:

poner una coma = to put a comma
poner mal una coma = to put a comma in the wrong place / use a comma incorrectly

This is very natural Spanish.

The adverb mal means badly, but in sentences like this it usually means incorrectly or in the wrong place.

So pongo mal alguna coma means something like:

• I still misplace the occasional comma.
• I still use some commas incorrectly.

No. In Spanish, algún / alguna with a singular noun often means some, an occasional, or the odd one.

So alguna coma does not mean one specific comma. It suggests one or another comma from time to time.

Here it gives the idea of:

• the occasional comma
• some comma here and there
• a few comma mistakes now and then

Compare:

Cometo algún error.
= I make the odd mistake / I make some mistakes.

Also note:

• alguna stays full before a feminine singular noun: alguna coma
• before a masculine singular noun it shortens: algún error

Yes, that is also possible.

Both of these are understandable and natural:

• pongo mal alguna coma
• pongo alguna coma mal

The version in your sentence sounds slightly more compact and puts mal earlier, so the idea of doing it incorrectly appears right away.

Spanish word order is often more flexible than English word order, especially with adverbs like mal. The exact placement can affect rhythm or emphasis more than basic meaning.

Because this sentence describes a habitual action: when/whenever I write quickly.

After cuando, Spanish uses:

• indicative for habitual, repeated, or known actions
• subjunctive for future or not-yet-real actions

So here:

cuando escribo deprisa
= when(ever) I write quickly

But:

cuando escriba el próximo informe
= when I write the next report

Your sentence is about something that happens regularly, so escribo is correct.

Deprisa means quickly or in a hurry.

It is very common and natural, especially in Spain.

You could also say:

• rápidamente = quickly
• rápido = quickly, in colloquial speech

But there are some differences:

• deprisa often suggests haste
• rápidamente is fully correct but can sound a bit more formal or neutral
• rápido is very common in speech, but learners are often safer using deprisa or rápidamente in more careful Spanish

So cuando escribo deprisa is a very natural Spain-Spanish choice.

Because pero introduces a contrast, while sino normally corrects something after a negative statement.

Here the meaning is:

My spelling is improving, but I still make this mistake.

That is a contrast, so pero is right.

Compare:

• Mi ortografía mejora, pero todavía cometo errores.
  = My spelling is improving, but I still make mistakes.

• Mi ortografía no mejora, sino empeora.
  = My spelling is not improving, but rather getting worse.

So in your sentence, pero is the correct word.

They have written accents because Spanish spelling marks the stressed syllable in cases where the normal stress rules would not show it correctly.

• ortografía is stressed on -fí-
• todavía is stressed on -ví-

In todavía, the accent also helps show that í-a is pronounced as two syllables:

to-da-ví-a

This is especially fitting in a sentence about spelling, because these accent marks are a real part of correct ortografía.