This sentence could refer to a dining couch, "the couch pleases you" / "you like the couch." One could see this sentence esp. given that there was a pecking order based on honor status. But "bed" works nicely, too. https://ancientromeandfinedining.weebly.com/the-dining-space.html
"Conjugation" only applies to verbs. But yes, there are declension tables.
Also, I was wrong. "Suus" is only the reflexive, as in "He likes his own bed." Otherwise it is in fact "eius" (which is the genitive, not the possessive).
Thank you so much, Rae. Latin is easy in the word order in a sentence, but much harder than other languages in its declension.
So "he likes HIS bed" is "Lectus eius ei placet" & "he likes YOUR bed" is "Lectus tuus ei placet".
Now, I need time to digest the new materials. Thanks again, Rae.
For the structure of this particular sentence: https://www.duolingo.com/skill/la/Routines/tips-and-notes
Here is a plain-English overview of what the cases are and how they work:
Latin cases, in English
Adjectives must agree in gender, number, and case with the nouns they modify, but they have their own declensions. Sometimes you get lucky and the adjective just happens to follow the same declension as the noun, but that is not a guarantee.