Sorry I [didn"t] know you were sick.括号中为什么用didn"t.

Sorry I [didn"t] know you were sick.括号中为什么用didn"t. 请问：I didn't know it were you.为什么一定要用were呢? Sorry,Tack,I(didn't know)you(were)in Jinan now Sorry,I didn't know you are foolish! 英语翻译I didn‘t know you were coming,so I didn’t buy any beer.( -Hello,i didn't know you were here. I didn't know you were in China . Hello!I didn’t know you were here. I didn't know you were so busy一般疑问句 I didn't know you were so busy. didn't know you were so busy. 英语语法问题I didn't know you were her mother和I didn't know you ar