Quelle
In "Quelle activité", this asks what or which activity. It is used with the feminine singular noun "activité"; reuse the pattern "Quelle + singular feminine noun" when choosing among options.
activité
In "Quelle activité", "activité" means activity, something people can do. It is the thing being chosen in the question; it can be used after a question word when asking what to do.
devrions
In "devrions-nous faire", this expresses what we should or ought to do. It is a form of devoir used with "nous" in a question; reuse "devrions-nous + infinitive" to ask for a suggestion.
nous
In "devrions-nous", "nous" means we and appears after the verb in this question. In "pour nous", it means us; reuse "pour nous" to express something intended for the speakers.
faire
In "devrions-nous faire", "faire" means do and refers to carrying out the activity being discussed. It follows "devrions-nous" as the action to be done; reuse a form of devoir followed by an infinitive.
On
In "On pourrait marcher", "On" means we and refers to the two speakers. It is commonly used as a subject for a group in everyday French; reuse "On + verb" when speaking about what a group does or might do.
pourrait
In "On pourrait marcher", "pourrait" expresses the suggestion that they could walk. It is a form of pouvoir followed by the infinitive "marcher"; reuse "On pourrait + infinitive" to propose an option.
marcher
In "pourrait marcher dehors", "marcher" means to walk. It follows "pourrait" as the possible activity; reuse a form of pouvoir followed by "marcher" when suggesting walking.
dehors
In "marcher dehors", "dehors" means outside and shows where the walking would happen. It can follow an action verb to indicate an outdoor location; the dialogue also uses it in "faire froid dehors".
Il
In "Il peut faire froid dehors", "Il" is the impersonal subject used in this weather statement, so it does not mean he here. Reuse "Il" in a weather expression such as "Il peut faire froid".
peut
In "Il peut faire froid dehors", "peut" expresses possibility: it may be cold outside. It is a form of pouvoir followed by the infinitive "faire"; reuse "peut + infinitive" to express what may happen or be possible.
froid
In "faire froid", "froid" describes cold weather. The weather meaning comes from the whole expression "Il peut faire froid dehors"; reuse "faire froid" when saying that it is cold.
Alors
At the start of "Alors, on peut lire à l'intérieur", "Alors" means then or so and connects this suggestion to the possible cold weather. Reuse it at the beginning of a sentence to introduce a consequence or next option.
lire
In "on peut lire à l'intérieur", "lire" means to read. It follows "peut" as the possible activity; reuse "on peut lire" when suggesting that a group can read.
à
In "à l'intérieur", "à" introduces the location inside. Together with "l'intérieur", it forms a place expression; reuse the exact phrase "à l'intérieur" to say where an action happens.
l'intérieur
In "à l'intérieur", "l'intérieur" refers to the inside or interior. Its location meaning comes with "à"; reuse "à l'intérieur" when contrasting an indoor place with outside.
est
In "Lire est mieux aujourd'hui", "est" means is and links the activity "Lire" with the evaluation "mieux". It is a form of être; reuse "X est mieux" to say that one option is better.
mieux
In "Lire est mieux aujourd'hui", "mieux" means better and presents reading as the preferred option today. Reuse it after "est" to evaluate one choice positively, as in "Lire est mieux".
aujourd'hui
In "Lire est mieux aujourd'hui", "aujourd'hui" means today and specifies when this preference applies. It can be placed at the end of a sentence to set the time for an opinion or situation.
Choisissons
In "Choisissons une pièce calme", "Choisissons" means let's choose and proposes a joint decision. It is used to invite the other person to act together; reuse "Choisissons + noun" when selecting something.
une
In "une pièce calme", "une" means a or one and introduces the room being selected. It is used before the feminine singular noun "pièce"; reuse "une + feminine singular noun" for one non-specific item.
pièce
In "une pièce calme", "pièce" means room. It is the place the speakers want to choose; reuse "une pièce + adjective" to describe a room.
calme
In "une pièce calme", "calme" means quiet and describes the room. It comes after "pièce" in this phrase; reuse "pièce calme" when referring to a quiet room.
Je
In "Je vais apporter mon livre", "Je" means I and identifies the speaker as the person making the plan. Reuse "Je + verb" to state your own action or intention.
vais
In "Je vais apporter", "vais" means am going to and helps express a planned action. It is a form of aller followed by the infinitive "apporter"; reuse "Je vais + infinitive" for a personal future plan.
apporter
In "Je vais apporter mon livre", "apporter" means to bring. It follows "vais" and takes "mon livre" as the thing being brought; reuse "apporter + object" when saying what you will bring.
mon
In "mon livre", "mon" means my and shows that the book belongs to or is associated with the speaker. It comes before the noun "livre"; reuse "mon + noun" to identify something as yours.
livre
In "mon livre", "livre" means book and is the object of "apporter". Reuse "mon livre" when referring to a book that belongs to the speaker.
trouver
In "Je vais trouver une place pour nous", "trouver" means to find. It follows "vais" and takes "une place" as its object; reuse "trouver + object" when saying what you intend to locate.
place
In "trouver une place pour nous", "place" means a spot or place, here a suitable place for the speakers to read. Reuse "trouver une place" when looking for somewhere to sit or stay.
pour
In "une place pour nous", "pour" means for and marks who the place is intended for. Reuse "pour + person" to show the intended recipient or beneficiary, as in "pour nous".