Note
なあ is used here to express a soft, reflective assertion
Breakdown of kare ha sinrai dekiru hito da naa.
人hito
person
はha
topic particle
彼kare
he
だda
to be
なあnaa
versatile and expressive particle often used in conversational Japanese to convey a range of emotions, from reflection and emphasis to longing and admiration
信頼 できるsinrai dekiru
trustworthy; able to be trusted
The structure [noun] + できる is a common way to express the ability or possibility related to the noun. This construction turns the noun into an adjective describing the noun that follows.
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