Si tu veux, je peux faire griller les crevettes pendant que tu laves les petits pois.

It means If you want or If you'd like.

In this sentence, Si tu veux is a very natural way to soften an offer. It has the feel of:

• If you want, I can...
• If you'd like, I can...
• I can do it, if that works for you

So it is not just a literal condition; it also sounds polite and cooperative.

Because after si in a normal if clause, French does not use the future or the conditional the way English sometimes seems to.

Here, French uses the present tense:

• Si tu veux, je peux... = If you want, I can...

Not:

• si tu voudras for this meaning
• si tu voudrais in standard French for this kind of basic condition

A very useful pattern is:

• si + present, then present / future / imperative in the main clause

Examples:

• Si tu veux, on part maintenant.
• Si tu veux, je le ferai demain.
• Si tu veux, appelle-moi.

So si tu veux is exactly what you would expect here.

Because tu is the informal singular you.

This sentence sounds like one person speaking casually to a friend, partner, family member, or child:

• Si tu veux, je peux...
• pendant que tu laves...

If you wanted a formal or plural version, you would use vous:

• Si vous voulez, je peux faire griller les crevettes pendant que vous lavez les petits pois.

So the choice of tu tells you about the relationship and tone, not the basic meaning.

Yes, je pourrais is possible, but je peux is more direct and straightforward.

• je peux = I can
• je pourrais = I could

In an offer like this, je peux often sounds perfectly natural and friendly:

• Si tu veux, je peux faire griller les crevettes...

It means something like:

• I can do that
• I’m able to do that
• I can take care of that

If you say je pourrais, it becomes a bit more tentative or softer:

• Si tu veux, je pourrais faire griller les crevettes...

That is closer to If you want, I could grill the shrimp...

Both work, but je peux is very common in everyday speech.

This is a very common learner question.

Literally, faire griller looks like make grill or have grilled, but in cooking French, faire + infinitive is often used to mean cause something to undergo a cooking process.

So:

• faire griller les crevettes = grill the shrimp / get the shrimp grilling

It does not necessarily mean that you are making someone else do it.

French often uses this kind of structure with cooking verbs:

• faire cuire = cook
• faire griller = grill
• faire fondre = melt

You can also say:

• je peux griller les crevettes

That is also understandable and natural. But faire griller is a very idiomatic cooking expression.

Because French often uses the definite article where English might use no article or a more general expression.

Here, les crevettes and les petits pois most likely refer to the specific ingredients already present in the situation:

• the shrimp
• the peas

Even if English might say:

• I can grill shrimp while you wash peas

French usually wants an article:

• je peux faire griller les crevettes
• tu laves les petits pois

If you said des crevettes or des petits pois, that would sound more like some shrimp or some peas, with a less specific feel.

So les here is very natural if both speakers know which shrimp and which peas they mean.

Pendant que means while or during the time that.

It specifically shows that the two actions happen at the same time:

• je peux faire griller les crevettes
• pendant que tu laves les petits pois

So the idea is:

• I grill the shrimp
• at the same time that you wash the peas

You could compare:

• pendant que = while
• quand = when

Quand is more general. Pendant que is better when you want to emphasize simultaneity.

There is also alors que, which can mean while, but it often brings a contrast as well. So in this sentence, pendant que is the most straightforward choice.

French uses the present tense very naturally for actions happening now or for actions happening as part of an immediate plan.

So:

• tu laves can mean you wash
• or you’re washing, depending on context

In this sentence, the idea is simultaneous action in a current or near-immediate situation:

• I can grill the shrimp while you wash the peas

French does not need a special progressive form as often as English does. The simple present usually covers it.

So:

• pendant que tu laves... = while you wash... / while you’re washing...

And tu laveras would mean you will wash, which does not fit the same smooth, simultaneous feel here.

Petits pois is the normal expression for peas, especially green peas.

Even though it literally looks like small peas, you should usually learn it as a set phrase:

• un petit pois = a pea
• des petits pois = peas

As for word order: yes, many French adjectives come after the noun, but some common ones often come before it, and petit is one of them.

So:

• un petit pois
• les petits pois

is completely normal.

Also, in this case the whole expression is so established that learners should really treat petits pois as the standard vocabulary item.

Here is a rough guide:

• Si tu veux ≈ see tyu vø
• je peux ≈ zhuh pø
• faire griller ≈ fehr gree-yay
• les crevettes ≈ lay kruh-vet
• pendant que tu laves ≈ pahn-dahn kuh tyu lahv
• les petits pois ≈ lay puh-tee pwah

A few useful pronunciation notes:

• In veux, peux, and pois, the final x or s is silent.
• crevettes ends with a pronounced t sound: kruh-vet
• griller ends with -er, which is usually pronounced -ay
• petits pois has a clear pwah sound at the end

The hardest vowel for many English speakers is the eu sound in veux and peux. There is no perfect English equivalent, so it usually takes practice.