病(びょう)気(き) byoukiなので nanode試(し)験(けん) shikenが ga受(う)け()ら()れ()ま()せ()ん() ukeraremasen。 I can't take the exam because I'm sick. Literal Sick [because-なので] exam [subject-が] cannot-take [polite-ません]. なので is the causal conjunction 'because,' polite variant. 試験が受けられません uses the potential form 受けられる with ません. A practical excuse in polite form. examshealth~ので (because)potential form (~える/~られる)
病(びょう)気(き) byoukiなので nanode試(し)験(けん) shikenが ga受(う)け()ら()れ()ま()せ()ん() ukeraremasen。 I can't take the exam because I'm sick. Literal Sick [because-なので] exam [subject-が] cannot-take [polite-ません]. なので is the causal conjunction 'because,' polite variant. 試験が受けられません uses the potential form 受けられる with ません. A practical excuse in polite form. examshealth~ので (because)potential form (~える/~られる)