1.do you know how old jack is?还是 do you know how old is jack

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1.do you know how old jack is?还是 do you know how old is jack?
2.200是tow hundred还是two hundreds
3000人是three thousand 还是three thounsands

1.是do you know how old jack is?因为在know后面是作为宾语（动词后面作为宾语）,要为陈述句语序（疑问副词+主语+谓语+宾语）
2.two hundred,因为hundred等thousand,million,billion都是在作为词组thousands of ,hundreds of ,millions of ,billions of ,才是可数的,而前面有数词时,都是不可数名词.
不懂继续问!
再问：那就是说没有 do you know how old is jack这种说法是吗?
再答：对

do you know how old she is how old is he?do you know?2并1 do you know how old_______ ___ do you know how old is kong ling hui Do you know_?Sorry,Idon't know.A.how old is Tom B.how old To 为什么是Do you know how old he is而不是he is? OK.Do you know me?well how old are you How do you know he is depressed? 同义词取代 Do you know （Tom's age）?A.where Tom is from B.How old do you know jack Green ?jack is Mr ,Green is什么 How do you know? do you know how() how do you know