问此句中of的用法是什么?Charlie and his family often take their boat out in the middle of the lake.

问此句中of的用法是什么?Charlie and his family often take their boat out in the middle of the lake. 此句中of 的用法?we hope these products will be of interest to you.此句中为何会有of,是否可以省略掉of,它在此句中的意义是什么? 求问：该句中used在句中修饰的是什么?在这里是什么用法?the teacher must believe in the effectiveness of the practices used. This was invitation enough.求此句中invitation用法此句中invitation的词性是什么?还是口头用语? 问其姓氏,是金陵人,客此的客在句子中是什么用法 that在这里是什么用法?此句analysts do agree on another matter:that the number of the homeless is increasing.中,that是什么用法?冒号是怎么回事儿,影响语法的使用吗? 英语此句子中of的用法Volunteer is of tremendous benefits to both those in need of society.此句中of 的用法.再举例一个.谢谢了. Tom was the first man to drive at over 300 miles per hour.句中“to“的 作用是什么为什么用to而不用of 呢to在此句中的用法是什么?能否再举些例子 lots of,a lot ,many,much,more的用法在句中什么时候用,举行是什么? I guarentee it is of first place.it is of 这是什么用法?此句是省略THAT的宾语从句么? 英语句子中逗号的用法she looked out of the window,as though thinking.此句中逗号可省吗?顺便讲一下逗号的使用方法, Toddy thought of the difficulty (with) which he managed to get the amount of money.Toddy thought of the difficulty (with) which he managed to get the amount of money 此句中with是什么用法,与那些词搭配? 英语翻译what后面加名词的用法what money I have has been given to you 翻译此句及说明what在此句中 的用法 引导的是什么句子? good luck charlie的人物介绍是什么? i did so without regret.此句中 so 是什么用法,如题最好多举几个例子 此“once”在句中的准确理解once在下句中是什么用法?The real function of new inventions will only be known once we discover new ways of thinking about the technology. 英语翻译句中over是什么用法?求整句翻译，再指点该句中over的用法， 翻译They found him already in the hands of a doctor.请翻译并讲解一下此句中find的用法