in a while一般用于句首、句中还是句末?还有after a while和for a while 呢?

in a while一般用于句首、句中还是句末?还有after a while和for a while 呢? once in a while in a while是什么意思 in a little while 区别在过去进行时当中when和while的用法?例句：The telephone rings while Jane is practicing the violin.老师说,此句中的while可以用when替换.而while 只用于过去进行时.when用于一般过去式,而在某些情况下也 also 用于一般否定句还是either in then一般用于什么时态? lots of和a lot of可以用于一般疑问句和否定句吗? see sb in a while Once In A While 歌词 in a while 等于什么 In A Little While 歌词 was,while,walking,I,saw,to,I,a,in,cat,school,a,tree(.)连词成句 英语翻译“keep me in your heart for a while”这句怎么翻译? after a while用于什么时态能用after a while举个例子吗？ in a while;after a while 的用法区别. for a while和in a while有什么区别? Do you often stay in a hotel or at home while travelling?这句是一般疑问句还是选择疑问句?Do you often stay in a hotel or at home while travelling?这句是一般疑问句还是选择疑问句?