情態(tài)動(dòng)詞表推測(cè)時(shí),就是虛擬語(yǔ)氣的一種形式.
記住以下句型：
一、對(duì)現(xiàn)在的推測(cè):
1.must be ＋名詞/ 形容詞/介詞短語(yǔ)/副詞(...一定是...)
He must be Tom.
He must be tired.
He must be at work.
He must be out .
2.must be doing(一定是正在做...)
He must be reading.他現(xiàn)在一定是在讀書.
He must be sleeping.他現(xiàn)在一定是在睡覺(jué).
二、對(duì)發(fā)生完的事情的推測(cè)
1.must have done (...一定是做過(guò).）
He must have seen me before.以前他一定是見(jiàn)過(guò)我.
You must have been to Shanghai.你一定是去過(guò)上海.
2.must have been doing( 一定是正在做...)
When you called me ,I must have been listening to music so I didn't hear that.你給我打電話時(shí),我一定是在聽(tīng)音樂(lè),所以沒(méi)聽(tīng)見(jiàn)電話.
She must have been playing at that time.那時(shí),她一定是在玩哪.
情態(tài)動(dòng)詞可根據(jù)語(yǔ)氣選擇不同的情態(tài)動(dòng)詞.