大声谈论英语

We were talking aloud when our teacher came in.While we were talking aloud, the teacher came in.

When teachers come in, we are talking aloud

We are dicussing loudly when teacher come in.或者We are talking aloud when teacher come in.

老师和你都不一定是错的，这要看语境了，语境当中是不是真的要翻译“大声讲话”，还是只需要“交流”这个意思就行。如果非要翻译“大声讲话”可以使speakout,speakloudly,talkloudly,speakup.其实都是“讲出来”，“说出来，让人听见，讲大声”的意思

to talk loudly