是in weekends 还是on weekends?

是in weekends 还是on weekends? 英语中是in the morning on weekends 还是on the morning on the weekends? 是in the weekends还是on the weekends我不确定,但是要写作文.麻烦帮帮忙. 英语中,是in weekends 还是in the weekends ,急! 后天期末on weekdays 还是in weekdays?in the weekends 在周末英语怎么说是on weekends还是at weekends.在工作日是on weekdays吗? on weekends 中 weekends 是指几天? 是on the weekends还是at she weekends详细和为什么 到底是on weekends还是at weekends比如：It's quiet there_________weekends. He often goes to see Beijing Opera ( )his parents (on,in)weekends 选ON 还是IN 初中英语介词（ ）weekends 是in还是at（ ）the evening of August 8th 2008,是in 还是on还是at ) weekends ,we often go to the zoo with parents.A.in B.at c.for d.on到底选B还是D? on weekends=at the weekends吗?或是on weekends=at the weekend还是on weekends=at weekends 是can you work on weekends还是can you like to work on weekends还是两个都行 Let's go and see Miss Wang on weekends,shall we?还是Let's go and see Miss Wang on weekends,shall not we?本句是反意疑问句吗? 在周末他想去看电影用英语怎么说 (不是过去式)在周末是on weekends还是on the weekends还是at weekends We often go swimming ( ) weekends.A.for B.on C.in D.during要原因 the morning of the weekends 用on,in还是at 快点回答为什么用on