I don't know how you can say things like that.
真想不到你怎么会说出这种话来。
I said I'd go just to keep him happy.
我说过我要去只是为了让他高兴。
It's a free country; I'll say what I like!
这是个自由的`国家，我想说什么就说什么！
It's not for me to say why he left.
不适宜由我说出他离开的原因。
He said he would be here at eight o'clock.
他说他将在八点钟到达这里。