Thanks for后面是doing吗?还有vacation前面的介词一定要是on吗?
at on in等介词 后面如果接动词的话 一定是doing形式的吗
介词后面加的动词一定是doing?
vacation是假期的的意思,那么他的介词搭配 on vacation与for vacation有什么区别么?
like 作介词像...来讲后面一定加doing吗
what are you doing for vacation .为什么用介词for 而不用on?
不定式中to的词性是什么?如果是介词,介词后面不是应该加doing吗?
what are you doing for vacation?可以用On替换for吗
介词后面的代词一定是宾语吗?
请问介词后面的动词为什么一定要是动名词?
前面介词一定是看定语从句中动词来确定吗?比如from which she come 还有介词+which whom一定可
it is + adj.+of/for sb.+to +doing?to是介词吗?介词后加doing?
what are you doing for vacation?在假期不是in vacation吗for不是为拉的意思吗