It was a difficult situation, when you think about it.
仔细想来，当时处境是很困难的。
What do I think about it? How long have you got?
我是怎么想的？说来话长，你有工夫听吗？
People just don't stop to think about the consequences.
人们做事情就是不肯停下来想想后果。
I often think about my friends back home.
我常常想起老家的朋友。
If you think about it, those children must be at school by now.
想想吧，那些孩子现在一定在学校了。