作文中虚拟句

虚拟语气在英语作文中非常有用，它可以用来表达假设、愿望、建议、与现在事实相反的情况等。以下是一些虚拟语气的例句和用法：

对现在情况的虚拟

If I were you, I would take an umbrella.

If only I had more time!

It is necessary for a teacher to have a thorough knowledge of the subject he teaches.

对过去情况的虚拟

If I had known about the party, I would have attended it.

If she had arrived earlier, she would have seen John.

They would have been here by now if they hadn't missed the train.

对将来情况的虚拟

If you had studied harder, you would have passed the exam.