我一时想不起来。 It's on the tip of my tongue. 这可问倒我了。 You've got me. 我的意思是。。。 I mean... 我不知说什么好。 I'm at a loss what to say. 我该说什么好呢? What should I say? 这个嘛。 Beats me....
你懂了吗? Do you understand? 你明白我的意思吗? Do you know what I mean? 清楚了吗? Is that clear? 明白了吗? Are you with me? 基本清楚了吗? Get the picture? 我说清楚了吗? Do I make myself clear? 你在听我说...