Paul nettoie le guidon du vélo pendant que je vérifie le pneu avant.

Because de + le contracts to du in French.

• de le vélo → du vélo
• So le guidon du vélo literally means the handlebar of the bike

This contraction happens regularly:

• de + le → du
• de + les → des

Examples:

• la porte du garage
• les roues des vélos

French often uses the + noun + of + the thing/person when talking about a part of something.

So:

• le guidon du vélo = the bike’s handlebar / the handlebar of the bike

Using son guidon is possible in some contexts, but it can be less clear, because son could mean his, her, or its depending on context. Le guidon du vélo is very explicit.

French uses articles much more often than English does. Where English might sometimes drop the, French usually keeps it.

In this sentence:

• le guidon = the handlebar
• du vélo = of the bike
• le pneu avant = the front tire

This is completely normal French. English is often a bit lighter with articles, but French generally is not.

Nettoie comes from the verb nettoyer, meaning to clean.

Here it is conjugated for il / elle / on in the present tense:

• je nettoie
• tu nettoies
• il/elle/on nettoie
• nous nettoyons
• vous nettoyez
• ils/elles nettoient

Since the subject is Paul, you use the il/elle/on form:

• Paul nettoie

The -e ending is the normal present-tense ending for this form.

Vérifie comes from vérifier, which means to check or to verify.

With je, the present tense is:

• je vérifie

So:

• je vérifie = I check / I am checking

This is a regular -er verb, so its present-tense pattern is very common.

Because in French, the simple present is often used for actions happening right now.

So:

• Paul nettoie...
• je vérifie...

can mean:

• Paul cleans... / is cleaning...
• I check... / am checking...

French does have ways to emphasize right now (for example être en train de), but the ordinary present tense is very commonly used for ongoing actions.

So this sentence sounds natural and normal.

Pendant que means while or during the time that.

It links two actions happening at the same time:

• Paul nettoie le guidon du vélo
• pendant que je vérifie le pneu avant

So the idea is:

• Paul is cleaning the handlebar
• while I am checking the front tire

It is a very common way to connect simultaneous actions.

Yes, often you could.

• pendant que = while
• tandis que = while, whereas

In many contexts they are similar, but tandis que can sometimes sound a little more formal or can suggest a contrast more strongly.

Here, pendant que is a very natural choice because the main idea is simply that the two actions happen at the same time.

Here avant is being used like an adjective meaning front.

So:

• le pneu avant = the front tire
• la roue avant = the front wheel

In French, many descriptive words come after the noun, unlike in English.

So even though English says front tire, French says literally tire front.

They are related, but not used the same way.

• avant often means before or front
• devant usually means in front of

In this sentence:

• le pneu avant = the front tire

That is different from something like:

• devant le vélo = in front of the bike

So here avant is the correct word because it identifies which tire it is: the front one.

Pneu can be tricky for English speakers.

A rough guide:

• it is one syllable
• something like pnuh, but with a French vowel sound

Important point:

• the p is pronounced
• so it is not like English new
• it begins with a consonant cluster: pn-

You may want to listen to native audio a few times, because this word is unusual at first.

The accent in vérifie helps show the pronunciation of the vowel.

The infinitive is:

• vérifier

The accent in vé- is part of the spelling of the verb. It is not added just for this form.

You will see this same accent in many related forms:

• je vérifie
• tu vérifies
• il vérifie
• la vérification

The accent helps indicate that the beginning sounds like vay- rather than a silent or reduced e.

Yes. Le guidon means the handlebar.

For a bike, le guidon is the bar you hold with your hands to steer.

Related vocabulary:

• le vélo = bike
• le guidon = handlebar
• la selle = seat / saddle
• la roue = wheel
• le pneu = tire

So le guidon du vélo is a very natural phrase.

In French, subject pronouns are normally required.

So you say:

• je vérifie
• tu vérifies
• il nettoie

Unlike in some languages, French usually does not drop the subject pronoun in ordinary sentences.

So je vérifie is the normal full form, not something optional.