Si tu oublies encore tes ciseaux, tu risques d’avoir une punition.

Si means if and introduces a condition.

So:

• Si tu oublies encore tes ciseaux = If you forget your scissors again
• tu risques d’avoir une punition = you risk getting a punishment / you may get punished

This is a very common French pattern: si + present tense, present tense for real or likely situations.

Because the subject is tu.

The verb is oublier (to forget), and in the present tense it changes like this:

• j’oublie
• tu oublies
• il / elle / on oublie
• nous oublions
• vous oubliez
• ils / elles oublient

So tu oublies means you forget.

In French, after si meaning if, you normally do not use the future tense for this kind of real condition.

French says:

• Si tu oublies..., tu risques...

not

• Si tu oublieras...

This is different from what some English speakers expect, because English can talk about the future with a present form too: If you forget again...

So this sentence uses a standard French pattern:

• si + present
• then present, future, or imperative, depending on the meaning

Here both parts are in the present.

Here encore means again.

So:

• Si tu oublies encore tes ciseaux = If you forget your scissors again

Be careful: encore can also mean still, depending on context.

Examples:

• Il dort encore. = He is still sleeping.
• Fais-le encore. = Do it again.

In this sentence, again is the natural meaning.

Because ciseaux means scissors, which is normally plural in French, just like in English.

So French usually says:

• des ciseaux = scissors
• tes ciseaux = your scissors

Even if it refers to one physical object, the noun is usually plural.

Also, because ciseaux is plural, the possessive adjective must be plural too:

• tes = your for plural nouns

So:

• tes ciseaux = your scissors

Usually, yes, when it means scissors.

You will most often see:

• un paire de ciseaux is incorrect
• une paire de ciseaux = a pair of scissors

and simply:

• des ciseaux
• les ciseaux
• mes / tes / ses ciseaux

French treats this noun as plural in normal use.

Risquer de + infinitive means to risk doing something or to be likely to have something happen.

So:

• tu risques d’avoir une punition

literally means:

• you risk having a punishment

In more natural English, it often means:

• you may get punished
• you’re likely to get a punishment
• you could end up with a punishment

This is a very useful structure:

• risquer de + infinitive

Examples:

• Tu risques de tomber. = You might fall.
• Il risque d’être en retard. = He might be late.

Because the verb risquer is followed by de before another verb.

The pattern is:

• risquer de + infinitive

So:

• risquer d’avoir
• risquer d’oublier
• risquer de perdre

The de becomes d’ before a vowel sound, which is why you get:

• d’avoir

not

• de avoir

French usually needs an article where English sometimes does not.

So French says:

• avoir une punition = to get a punishment

Even if English might more naturally say:

• to be punished
• to get punished

the French noun punition normally takes an article here.

Other similar examples:

• avoir une idée = to have an idea
• faire une erreur = to make a mistake

It is grammatical and clear, especially in a school context. It suggests receiving some kind of punishment.

Depending on context, French speakers might also say things like:

• tu vas être puni(e) = you’re going to be punished
• tu risques d’être puni(e) = you risk being punished
• tu auras une punition = you’ll get a punishment

But tu risques d’avoir une punition is perfectly understandable and natural enough, especially when talking to a child or student.

Yes, it could be vous, depending on who you are talking to.

• tu = singular informal you
• vous = plural you, or singular formal you

So this sentence is informal, probably said to one child, friend, or student:

• Si tu oublies encore tes ciseaux...

A more formal or plural version would be:

• Si vous oubliez encore vos ciseaux, vous risquez d’avoir une punition.

The sentence has two parts:

1. Si tu oublies encore tes ciseaux
2. tu risques d’avoir une punition

The first part gives the condition, and the second part gives the result.

The comma helps separate those two ideas, just like in English:

• If you forget your scissors again, you risk getting a punishment.

French can sometimes omit the comma in short sentences, but using it here is normal and helpful.

A simple pronunciation guide is:

Si tu oublies encore tes ciseaux, tu risques d’avoir une punition.

Approximate pronunciation:

see ty oo-blee ahn-kor tay see-zo, ty reesk da-vwar ewn py-nee-syon

A few notes:

• si sounds like see
• tu has the French u sound, not the English too
• oublies sounds roughly like oo-blee
• ciseaux sounds like see-zo
• risques sounds like reesk
• punition ends with a nasal sound in -tion

Sometimes, but its position here is very natural.

• Si tu oublies encore tes ciseaux... = If you forget your scissors again...

Putting encore near oublies makes it clear that again modifies the forgetting.

Other placements may be possible in speech, but this version is the standard and most straightforward one for learners.

Risques is the present tense of risquer.

Conjugation:

• je risque
• tu risques
• il / elle / on risque
• nous risquons
• vous risquez
• ils / elles risquent

So:

• tu risques = you risk / you are likely to

Even though the whole sentence refers to a possible future consequence, French still uses the present tense here.