是on this weekend还是at this weekend?急,考试必要,

是on this weekend还是at this weekend?急,考试必要, in/on/at this weekend是in this weekend,on this weekend还是at this weekend in on at 关于时间的用法在下周 next week 前的介词用哪个 我们说 on weekend ,at weekend,还是in the weekend 在周末是at weekend 还是on weekneds? 在周末英语到底是＂at weekend还是on weekend? 是 What do you do at the weekend 还是What do you do on the weekend weekday 和weekend用on还是at What's on at the cinema this weekend 在周末用英语怎样表达是at the weekend 还是 on the weekend 二者有什么区别吗? 在周末是用at the weekend还是on the weekend?小学课本用on,初中课本为什么又用at? 是on weekday还是on the weekday是on the weekend 还是on weekend急 this weekend是一般现在时,还是一般将来时 weekend什么时候要加介词?我好像看到过this weekend,on weekends,at weekends 是 in the weekend 还是 on thr weekend 如题. weekday和weekend前面用in,on还是at on the weekend or at the weekend 如何区分at weekend 与 on weekend 英语在周末应该是on the weekend 还是 at the weekend,并请说明原因.