宾语从句:I don't know what they looking for .主句和从句宾语从句:I don't know what they looking for .主句和从句各指什么?

I know it that classmates don't know.是一个宾语从句吗? Dose the enigineer know french?(I don't know)改为宾语从句 宾语从句I don't know what is his name 还是 I don't know what his name is? 宾语从句:I don't know what they looking for .及物动词宾语从句:I don't know what they looking for .及物动词指什么? I don't know what to do (改为含有宾语从句的复合句） I don't know, how much did the book cost.改为宾语从句,谢了 I don't know what to do next.改为宾语从句稍作解释 I don't know what‘s wrong做宾语从句时,语序是否不变? I don't know what to do next 改成宾语从句 I don't know what to do next.改为宾语从句讲讲理由 宾语从句I don't know _ to visit the old man.A whether B if whose 引导的宾语从句.这样：I don't know whose watch it is . 什么时候宾语从句用陈述句语序什么时候不用 I don't know what's your hobbies 宾语从句的否定形式i don't think i know you能不能写成i think i don't know you如果不能为什么? 宾语从句:I don't know what they looking for .主句和从句宾语从句:I don't know what they looking for .主句和从句各指什么? I don*t know if he will come tomorrow 宾语从句 不懂哪个I don*t know if he will come tomorrow 宾语从句 不懂哪个是主句 哪个是从句 I don't know 后面跟的宾语从句是用现在还是用过去时态?比如 I don't know what you said /say.那个准确宾语从句 主句和从句的时态 可以 前后不一致吗？ 宾语从句中,是I don't know what the matter is,还是I don't know what's the matter?希望能说明理由,