1. The reason is that I got up too late.
原因是我起床太晚了。
The key is that he is too lazy.
关键是他太懒了。
2. The problem is whether he is free.
问题是他是否有空。
The trouble is whether she loves you.
麻烦是她是否爱你。
3. The question is what you like.
问题是你喜欢什么。
My problem is what you can talk about.
我的问题是你能谈些什么。
4. The problem is when I have time.
问题是我什么时候才有空。
His question is when you can help him.
他的问题是你什么时候可以帮助他。