I've Just Bitten My Tongue
我剛咬破自己的舌頭
"Are we poisonous?" the young snake asked his mother.
“我們有毒嗎？”一個年幼的蛇問它的母親。
"Yes, dear," she replied - "Why do you ask?"
是的，親愛的，”她回答說，“你問這個干什么？
"Cause I've just bitten my tongue! "
因為我剛剛咬破自己的舌頭。

1.poisonous
adj:有毒的；惡毒的，有惡意的；有害的
eg:This medicine is poisonous if taken in large quantities. 這種藥若服用過量是有害的。
eg:He has unique skills in catching poisonous snakes. 他捉毒蛇有絕招。

2.snake
snake是蛇的意思，作名詞是也有奸險的人,卑劣的人的意思。 　　
eg：That snake in the grass reported me to the teacher. 那個口蜜腹劍的家伙到老師那里告了我一狀。
下面我們來看一個和snake長得很像的單詞—snack
snack：快餐;小吃,點心 　
eg：He ate a snack before resuming work. 　他吃了一份快餐而后繼續工作。

3.have just bitten my tongue.
這是現在完成時，非常簡單。今天我們就來拓展一下，簡單學習一下“情態動詞＋不定式的完成時”，表示對發生過的事作某種猜測、推測。
(1) must have done 可用來對某件過去的事情作肯定推測，表示“一定已經，想必已經”做過某事，用于肯定的陳述句中。否定句中用 can't have done。
She must have received the parcel, I sent it by registered post.
她一定已經收到包裹了，我是用掛號寄的。
(2) may have done, might have done, could have done “可能做過某事”，就語氣而言 could have done 所表的可能性更小些。
He may / might / could have left by nine.
他可能于九點前已離去。
(3) should have done / ought to have done 表示“本該做某事”但實際未做。
I should / ought to have left London before nine but I didn't.
我本該在九點以前離開倫敦，但是我沒有。