大家肯定都有过这种切身经历，话到嘴边却突然想不起来要说什么，大脑一片空白。我们来看看英语中怎么表达这个意思。
1. it's on the tip of my tongue: use
this to say that you know a name or word, but you are having difficulty
remembering it at that moment
备注：这是口语用法。
例：
That place we visited in Paris, what's it
called? It's on the tip of my tongue.（在巴黎时我们去过的那个地方，叫什么来着？突然想不起名字了。）
His name was right on the tip of my tongue.（他名字就在嘴边，一下想不起来了。）
2. escape: if a name, detail, fact
etc. escapes you, you forget it for a very short time but you know you will
remember it soon
备注：这是口语用法。
例：
I know I've heard this song before but its
name escapes me.（我觉得我听过这首歌，但是歌名一时想不起来。）
Although I know that the novel was
published in the nineteenth century, the actual date escapes me.（我知道这本小说是19世纪发行的，但具体的日期一时想不起来。）
For some reason which escapes me, we had to
take a taxi.（我们必须打车去，但什么原因我一时想不起来了。）
3. can't place: if you can't place
someone or something, you recognize them but have forgotten their name or where
you met them before
备注：这是口语用法。
例：
I'm sure I've seen him before, but I just
can't place him.（我确定我见过他，但在哪见过，我却想不起来了。）
Her perfume seemed so familiar but he
couldn't place it.（他觉得她喷的香水味道很熟悉，但却想不起来在哪里闻过。）
The man looked familiar but she couldn't
quite place him.（这人看起来很面熟，但她不太叫得出来他的名字。）
It wasn't until later that I placed her
face: she was my ninth grade English teacher, Ms. Lee.（我直到后来才认出，她原来是我9年级的英语老师李老师啊。）
4. your mind goes blank: if your
mind goes blank you are suddenly unable to remember something at a time when
you need it
备注：类似的用法还有''your
mind is blank''或''blank（做动词使用）''。
例：
That's... Oh, my mind's gone blank - I
can't remember her name.（她叫……哎唷，我大脑一片空白，记不起她名字了。）
My mind goes blank when I have to take a
test.（我大脑一片空白，我要去休息一下了。）
My mind went blank when I heard the
question.（听到这个问题，我大脑一片空白。）
My heart began to race and my mind went
blank.（我心跳加速，大脑一片空白。）
I just blanked in the oral exam.（口语考试的时候，我大脑一片空白。）
5. dry up: to forget what you were
going to say or what you are supposed to say when speaking or acting,
especially because you are nervous
备注：这是英式英语的用法。
例：
I dried up just as I was about to talk, even
though I had been preparing the speech for weeks.
（虽然这个演讲我已经准备了几周，但一开口还是忘词了。）
There was one worrying moment where one of
the actors seemed to dry up for a few seconds.
（有个演员忘词愣了几秒钟，那会儿真叫人担心。）