我们该上英语课了.It's time -----us----- ------English.

以上这位是对.
*have English means there is English class for you to study maybe tomorrow morning,not now;have English 意为有英语课,如我们有数学课——We have Maths(class) this afternoon.或者说have English有一种开了这门课的意义在里面,如：This term we don't have English.所以你理解后就知道,
*在此题中,说的是It's time for sb.to do sth的句型,意为是时间做某事,要是明白虚礼语气的同学更知道,It's time that……的句型等于it's time to do的句型意为,早改是做什么的时候了；
*总结以上的知识点后,你会发现用"It's time for us to study/learn English"才是最准确的,而不用have English
再问： English后面还有个class
再答： 如果有class i think using a "take or attend" would be better. we can't say to study or learn English class, we can say to study/learn English; 也就是说我们不能说学习learn英语课，只能说上take/attend 英语课 而也不用have,because 1.have/has后的class 一般变单复数，eg. has an English class or have English classess 这是形式上 2。意义上（这是最重要的）have 永远都有一种“有什么”的这个意思在里面（特别是当他作为实义动词时。而上句不是能说是时间有英语课，这显然不太好，而是说是时间上课了，take **class or attend **class means The teacher will be coming, we should go and to study now.So we say it's time for us to take/attend(attend is more formal) English class. 你也会见到这样说的we say " it's about time/ high time (for sb.) to do sth. 补充：有朋友如果用虚礼语气可以说It's time /about time /high time (that可省） we took （一定用过去式，也就是说此句子意思要是用重句时，重句一定用虚礼语气句型）attended English class.