Credo che l’acceleratore sia più sensibile del solito oggi.

Because credere che often introduces something that is believed, supposed, or uncertain, so Italian commonly uses the subjunctive after it.

• sia = present subjunctive of essere
• è = present indicative of essere

So:

• Credo che l’acceleratore sia... = I think the accelerator is...

This is a very common pattern in Italian:

• Penso che sia vero.
• Credo che abbiano ragione.

In everyday speech, you may sometimes hear the indicative after credo che, but the standard and expected form here is the subjunctive.

L’acceleratore usually means the accelerator, the gas pedal, or sometimes the throttle, depending on context.

In a sentence like this, a native English speaker would most likely understand it as:

• the gas pedal in a car, or
• more generally, the accelerator/throttle response

So the sentence suggests that the pedal or throttle seems more responsive than usual today.

The apostrophe shows elision.

The singular definite article lo or la becomes l’ before a word beginning with a vowel:

• l’acceleratore
• l’amica
• l’uomo

Here, acceleratore begins with a-, so Italian uses l’ instead of the full article form.

This is a comparative structure:

• più = more
• sensibile = sensitive / responsive
• del solito = than usual

So:

• più sensibile del solito = more sensitive than usual

The pattern is:

• più + adjective + di/del...

Examples:

• più veloce del normale = faster than normal
• più rumoroso del solito = noisier than usual

In this sentence, sensibile means something like responsive rather than emotional or easily hurt.

Del solito is an idiomatic expression meaning than usual or than normal.

Literally, it comes from di + il solito → del solito, but you should learn it as a set phrase:

• più caldo del solito = warmer than usual
• meno affollato del solito = less crowded than usual

It does not mean of the usual in normal English. In this sentence, oggi simply adds today:

• del solito oggi = than usual today / more naturally in English, today than usual

Italian often places time expressions like oggi quite flexibly. Putting it at the end is completely natural.

So these are all possible, with slightly different emphasis:

• Credo che l’acceleratore sia più sensibile del solito oggi.
• Oggi credo che l’acceleratore sia più sensibile del solito.
• Credo che oggi l’acceleratore sia più sensibile del solito.

The version with oggi at the end sounds natural and lets the sentence build first, then add the time reference.

Yes, but in context it is better understood as responsive, touchy, or over-sensitive.

Italian sensibile can correspond to English sensitive, but the best translation depends on what is being described.

For a machine or control, it can mean:

• very responsive
• reacting to small movements
• more touchy than usual

So in natural English, someone might say:

• I think the accelerator is more responsive than usual today.
• I think the gas pedal is a bit touchier than usual today.

Yes. Credo che and Penso che are often very close in meaning.

• Credo che l’acceleratore sia...
• Penso che l’acceleratore sia...

Both can mean I think that...

A rough difference is:

• credo can feel a bit more like I believe / I suppose
• penso can feel a bit more like I think

But in many everyday contexts, they are interchangeable.

Because Italian usually does not need a separate subject pronoun when the subject is already expressed.

Here, the subject is explicitly l’acceleratore, so there is no need for an extra word meaning it:

• l’acceleratore sia più sensibile...

Italian normally avoids adding pronouns unless they are needed for contrast or emphasis.

Compare:

• È nuovo. = It is new.
• L’acceleratore è nuovo. = The accelerator is new.

In English, it is required much more often than in Italian.

Yes. In this sentence, che is the conjunction that:

• Credo che... = I think that...

It introduces the subordinate clause:

• che l’acceleratore sia più sensibile del solito oggi

Italian uses che very frequently in this way after verbs of thinking, saying, hoping, and feeling:

• So che è tardi. = I know that it’s late.
• Spero che vada bene. = I hope that it goes well.

No, not in normal standard Italian with this structure.

You say:

• Credo che l’acceleratore sia più sensibile del solito oggi.

Not:

• Credo l’acceleratore sia...

Italian needs che to introduce the clause after credo in this kind of sentence.

It breaks down like this:

• Credo = I think
• che = that
• l’acceleratore = the accelerator / gas pedal
• sia = is (subjunctive)
• più sensibile = more sensitive / responsive
• del solito = than usual
• oggi = today

So the structure is:

• main clause: Credo
• subordinate clause introduced by che: l’acceleratore sia più sensibile del solito oggi

A useful pattern to remember is:

• Credo che + [subject] + subjunctive

For example:

• Credo che sia tardi.
• Credo che Marco abbia fame.
• Credo che la macchina funzioni meglio oggi.