あなたはいつも真実を語るべきだ。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

always; usually; every time; never

truth; reality

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to talk about; to speak of; to tell; to narrate; to recite; to chant; to indicate; to show

shall; should; must

be; is; indicates past or completed action; indicates light imperative