Dr. Seuss's Beginner Book Boxed Set Collection: The Cat in the Hat; One Fish Two Fish Red Fish Blue Fish; Green Eggs and Ham; Hop on Pop; Fox in Socks
'Would' is included in the conditionnel of a particular verb, 'could' and 'should' are expressed by separate forms of pouvoir and devoir (pourrais/ais/ait/ions/iez/aient and devrais/ais/ait/ions/iez/aient).
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