I've Just Bitten My Tongue
我刚咬破自己的舌头
"Are we poisonous?" the young snake asked his mother.
“我们有毒吗？”一个年幼的蛇问它的母亲。
"Yes, dear," she replied - "Why do you ask?"
是的，亲爱的，”她回答说，“你问这个干什么？
"Cause I've just bitten my tongue! "
因为我刚刚咬破自己的舌头。

1.poisonous
adj:有毒的；恶毒的，有恶意的；有害的
eg:This medicine is poisonous if taken in large quantities. 这种药若服用过量是有害的。
eg:He has unique skills in catching poisonous snakes. 他捉毒蛇有绝招。

2.snake
snake是蛇的意思，作名词是也有奸险的人,卑劣的人的意思。 　　
eg：That snake in the grass reported me to the teacher. 那个口蜜腹剑的家伙到老师那里告了我一状。
下面我们来看一个和snake长得很像的单词—snack
snack：快餐;小吃,点心 　
eg：He ate a snack before resuming work. 　他吃了一份快餐而后继续工作。

3.have just bitten my tongue.
这是现在完成时，非常简单。今天我们就来拓展一下，简单学习一下“情态动词＋不定式的完成时”，表示对发生过的事作某种猜测、推测。
(1) must have done 可用来对某件过去的事情作肯定推测，表示“一定已经，想必已经”做过某事，用于肯定的陈述句中。否定句中用 can't have done。
She must have received the parcel, I sent it by registered post.
她一定已经收到包裹了，我是用挂号寄的。
(2) may have done, might have done, could have done “可能做过某事”，就语气而言 could have done 所表的可能性更小些。
He may / might / could have left by nine.
他可能于九点前已离去。
(3) should have done / ought to have done 表示“本该做某事”但实际未做。
I should / ought to have left London before nine but I didn't.
我本该在九点以前离开伦敦，但是我没有。