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### In case of: *en cas de*

To state a condition quickly and efficiently, you can use the phrase **en cas de** (in case of) followed directly by a noun. This allows you to set up a scenario without needing a full clause with a subject and a verb.

Remember that **de** becomes **d'** before a vowel or a mute *h*.

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You can place the *en cas de* phrase at the beginning of the sentence to set the scene, or at the end.

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### Home security and emergencies

This grammar structure is especially useful for discussing emergency preparations, protocols, and home security systems. You will often see it paired with vocabulary like *le capteur* (the sensor), *le détecteur* (the detector), and *le boîtier* (the control box).

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In case of (en cas de)

adjective

adverb

conjunction

contraction

determiner

interjection

noun

numeral

particle

phrase

prep

preposition

pronoun

sentence

verb

Definite articles and elision (le, la, l')

Indefinite articles (un, une)

Identifying vs. describing (c'est vs. il est)

Feminine adjective agreement (+e)

Plural pronouns and 'to be' (nous sommes, vous êtes)

Formal and informal you (tu vs. vous)

Plural nouns and indefinite articles (des... -s)

Plural definite articles (les)

Plural adjective agreement (+s)

Stressed pronouns (moi, toi, lui)

The verb "to have" singular (j'ai, tu as, il a)

The verb "to have" plural (nous avons, vous avez, ils ont)

There is / there are (il y a)

Basic verbal negation (ne... pas)

Negating "there is" (il n'y a pas de)

Regular -er verbs singular (je parle, tu parles, il parle)

Regular -er verbs plural (nous parlons, vous parlez, ils parlent)

The verb "to be called" (s'appeler)

Yes/no questions with intonation (Tu parles ?)

Yes/no questions with "Est-ce que" (Est-ce que tu parles ?)

Informal questions (qui, que, quoi)

Standard questions (est-ce que)

Singular possessives (mon, ton, son)

Plural possessives (notre, votre, leur)

Demonstrative adjectives (ce, cet, cette, ces)

Adjective placement

Numbers 1 to 20

Numbers 21 to 100

Age and physical states (avoir)

The verb to go (aller)

The preposition to/at (à, au, aux)

Question word for location (où)

Prepositions for cities and countries (à, en, au, aux)

The verb to come (venir)

The preposition from/of (de, du, des)

Question word for origin (d'où)

The verb to do/make (faire)

Days of the week (lundi, mardi)

Telling time (il est... heure)

Question words for time (quand, à quelle heure)

The verb to take or have (prendre)

The verb to drink (boire)

Partitive articles (du, de la, de l')

Zero quantity (pas de)

Expressions of quantity (un peu de, beaucoup de)

Asking how much or how many (combien, combien de)

Very vs. a lot (très, beaucoup)

The verb to want (vouloir)

Polite requests (je voudrais)

The verb to be able to (pouvoir)

Obligation (devoir)

General obligation (il faut)

Why and because (pourquoi, parce que)

Expressing purpose (pour)

Reflexive pronouns (me, te, se, nous, vous)

Daily routine verbs (se lever, s'habiller)

Adverbs of frequency (parfois, rarement)

Never (ne... jamais)

Regular -ir verbs (choisir, finir)

Regular -re verbs (attendre, répondre)

Irregular -ir verbs (sortir, partir, dormir)

Informal 'we' (on)

The imperative mood

Direct object pronouns (le, la, les, l')

The near future (aller + infinitive)

The recent past (venir de + infinitive)

The passé composé with avoir

Irregular past participles (eu, été, fait, pris, vu)

The passé composé with être

The negative passé composé (ne ... pas)

Saying goodbye

Please, sorry and thank you

Which / what (quel)

The indefinite adjective (tout, tous)

Irregular feminine adjectives (-euse, -ve)

Double consonant adjectives (-enne, -ette)

Feminine adjective endings (-ère, -trice)

Irregular plurals (-x)

Plurals ending in -al (-aux)

Present tense stem changes (e to è)

Accent stem changes (é to è)

Double consonant verbs (appeler, jeter)

Verbs ending in -yer (payer, envoyer)

Irregular communication verbs (dire, lire)

Irregular action verbs (écrire, mettre)

Question	Answer
in case of	en cas de
the break-in (f)	l'effraction
the alert (f)	l'alerte
In case of a break-in, the system gives the alert.	En cas d'effraction, le système donne l'alerte.
the flood (f)	l'inondation
the sensor	le capteur
to alert	alerter
In case of a flood, this sensor will alert the owner.	En cas d'inondation, ce capteur va alerter le propriétaire.
the detector	le détecteur
the gas	le gaz
Here is the detector that finds gas leaks.	Voici le détecteur qui trouve les fuites de gaz.
the protocol	le protocole
What is the protocol in case of a flood?	Quel est le protocole en cas d'inondation ?
the control box	le boîtier
In case of a break-in, there is a control box that warns the police.	En cas d'effraction, il y a un boîtier qui prévient la police.
We have been using this gas detector for two years.	Nous utilisons ce détecteur de gaz depuis deux ans.
The sensor is plugged into the control box.	Le capteur est branché au boîtier.
It is a matter of giving the alert to warn the neighbors.	Il s'agit de donner l'alerte pour prévenir les voisins.
In case of a gas leak, you must follow the protocol.	En cas de fuite de gaz, vous devez suivre le protocole.
The detector triggered the alert last night.	Le détecteur a déclenché l'alerte hier soir.
In case of a break-in, the sensor alerts the police.	En cas d'effraction, le capteur alerte la police.