怎么说 "I didn't know you could speak chinese" I'm not sure how to say "I didn't know" (PAST TENSE) in mandarin. Maybe I'm confusing myself, sometimes past tense sounds too easy and strange in my head. I've tried coming up with sentences myself, but they don't sound right: 我不知道你会说中文 <--- No indication that it is past tense (for as far as I know) 我不知道你能说中文 <--- can 能 be used in a sentence like this one? I look forward to learning about this matter.