大學(xué)英語四級(jí)語法精要：情態(tài)動(dòng)詞（四）
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時(shí)間：
情態(tài)動(dòng)詞后接進(jìn)行式, 完成式和完成進(jìn)行式:
a) 情態(tài)動(dòng)詞可以和動(dòng)詞的進(jìn)行式構(gòu)成謂語, 表示”應(yīng)該正在…”, “想必正在…”這類意思:
Why should we be sitting here doing nothing?
This isn’t what I ought to be doing.
She might still be thinking about the question you raised.
They must (may) be waiting for us, let’s hurry up.
They can’t be using the room now.
b) 情態(tài)動(dòng)詞有時(shí)和動(dòng)詞的完成形式構(gòu)成謂語, 表示”應(yīng)當(dāng)已經(jīng)…”, “想必已經(jīng)…”這類意思:
I should have thought of that.
They shouldn’t have left so soon.
She must have arrived by now.
You needn’t have told them that.
Where can (could) he have gone?
He can’t have finished the work so soon.
He may not have achieved all his aims. But his effort is praise-
worthy.
We ought to have give you more help.
c) 情態(tài)動(dòng)詞間或也可以和一個(gè)動(dòng)詞的完成進(jìn)行式構(gòu)成謂語,表示”應(yīng)當(dāng)一直在…”, “想必一直在…”這類意思:
They are sweating all over. They must have been working in the fields.
They may have been discussing the problem this morning.
You should have been waiting for us. Why haven’t you?
She couldn’t have been swimming all day.
a) 情態(tài)動(dòng)詞可以和動(dòng)詞的進(jìn)行式構(gòu)成謂語, 表示”應(yīng)該正在…”, “想必正在…”這類意思:
Why should we be sitting here doing nothing?
This isn’t what I ought to be doing.
She might still be thinking about the question you raised.
They must (may) be waiting for us, let’s hurry up.
They can’t be using the room now.
b) 情態(tài)動(dòng)詞有時(shí)和動(dòng)詞的完成形式構(gòu)成謂語, 表示”應(yīng)當(dāng)已經(jīng)…”, “想必已經(jīng)…”這類意思:
I should have thought of that.
They shouldn’t have left so soon.
She must have arrived by now.
You needn’t have told them that.
Where can (could) he have gone?
He can’t have finished the work so soon.
He may not have achieved all his aims. But his effort is praise-
worthy.
We ought to have give you more help.
c) 情態(tài)動(dòng)詞間或也可以和一個(gè)動(dòng)詞的完成進(jìn)行式構(gòu)成謂語,表示”應(yīng)當(dāng)一直在…”, “想必一直在…”這類意思:
They are sweating all over. They must have been working in the fields.
They may have been discussing the problem this morning.
You should have been waiting for us. Why haven’t you?
She couldn’t have been swimming all day.