Marie a du mal à suivre la conversation quand tout le monde parle trop vite.

It is a very common French expression meaning to have trouble, to struggle, or to find it hard to do something.

So:

• Marie a du mal à suivre la conversation = Marie has trouble following the conversation

It is best learned as a fixed pattern:

• avoir du mal à + infinitive

Examples:

• J’ai du mal à comprendre = I have trouble understanding
• Ils ont du mal à se réveiller = They have trouble waking up

Even though mal by itself often means badly, in this expression the whole phrase has the idiomatic meaning to have difficulty.

Because the expression is:

• avoir du mal à + verb in the infinitive

So after avoir du mal, French uses à before the next verb.

Here:

• suivre is the infinitive
• à suivre = to follow / following

You should think of it as one grammar pattern, not as a word-for-word translation from English.

Because suivre is a direct verb in French. It takes a direct object without a preposition.

So:

• suivre la conversation = to follow the conversation
• suivre un film = to follow a film
• suivre un cours = to follow a class

English sometimes uses follow in a similar way, but French uses it very naturally to mean keep up with or understand the flow of something.

They are completely different words.

• a without an accent is the verb avoir in the third person singular: has
• à with an accent is a preposition, often meaning to or introducing another structure

In this sentence:

• Marie a du mal = Marie has trouble
• à suivre = to follow / in following

This is one of the most important spelling distinctions in French.

Because tout le monde is grammatically singular in French, even though it refers to many people.

So French says:

• tout le monde parle = everyone is speaking / everyone speaks

Not:

• tout le monde parlent

This is similar to English everyone speaks, not everyone speak.

Tout le monde means everyone or everybody.

Literally, it looks like all the world, but in normal French it usually means everyone.

Examples:

• Tout le monde est là = Everyone is here
• Tout le monde comprend = Everyone understands

So in your sentence:

• quand tout le monde parle trop vite = when everyone speaks too fast

Quand means when.

It introduces the time clause:

• quand tout le monde parle trop vite = when everyone speaks too fast

In this sentence, quand does not point to one single moment only. It can also express a general situation or repeated circumstance:

• Marie has trouble following the conversation when everyone talks too fast

So the sentence can describe a habitual or typical situation.

French often uses the present tense to describe general truths, habits, or situations that happen regularly.

So:

• Marie a du mal = Marie has trouble
• quand tout le monde parle trop vite = when everyone speaks too fast

This does not have to mean it is happening right now only. It can mean this is generally true.

English does something similar:

• She has trouble following the conversation when everyone speaks too fast

This is an important difference.

• très vite = very fast / very quickly
• trop vite = too fast / too quickly

Trop implies more than is acceptable, manageable, or desirable.

So here:

• parle trop vite means people are speaking at a speed that makes it hard for Marie to follow

If you said très vite, it would only say the speed is high, not necessarily excessive.

Because vite is an adverb, and in French adverbs like this often come after the conjugated verb.

So:

• parle vite = speaks quickly
• parle trop vite = speaks too quickly

Here, trop modifies vite:

• trop vite = too quickly

That whole adverb phrase comes after the verb parle.

La conversation refers to the conversation in question, the one Marie is trying to follow.

French often uses the definite article when talking about something specific in the situation or something understood from context.

So:

• suivre la conversation = follow the conversation

If you said une conversation, it would sound more like a conversation, one among many, less tied to the specific situation.

Yes, very often.

French speakers commonly say:

• avoir du mal à + infinitive

It is one of the most natural everyday ways to express difficulty.

Another possibility is:

• avoir des difficultés à
• éprouver des difficultés à

But those are often a bit more formal or less conversational.

So in ordinary speech, Marie a du mal à suivre la conversation sounds very natural.

Yes. In this kind of context, suivre often means to follow what is being said, which naturally includes the idea of keeping up and understanding.

For example:

• Je ne suis pas can mean I’m not following
• Tu suis ? can mean Are you following?

So suivre la conversation is not just physically hearing words. It means keeping up with the flow of what people are saying.