要是他努力的话，他就会通过考试。非真实条件句。含义是。

He would pass the final exams if he worked hard.

youdao

我认为使用unless加else条件句就好像在讲双重否定。

I think using unless with else is like speaking with double negatives.

youdao

如果明天下雪，我们将很高兴。(与将来事实相反的虚拟条件句)。

If it should (If it were to) snow tomorrow, we would be very happy.

youdao

如果明天下雪，我们将很高兴。(与将来事实相反的虚拟条件句)。

If it should (If it were to) snow tomorrow, we would be very happy.

youdao