系動詞 to be, 助動詞 do(does), have(has), shall(should), will(would) 以及情態動詞在句中一般是不重讀的。但是它們在以下幾種情況下是有句子重音的:
1.)在肯定陳述句中表示強調時,例如:
She 'is a doctor.
l 'am a student.
They 'are students.
He 'has done it.
l 'have told you before.
l 'shall come.
He 'will do it.
l 'can do it.
He 'may be there.
2.)和否定副詞 not 連寫成簡縮式 aren't, isn't, don't, doesn't, haven't, hasn't, shan't, shouldn't, won't, wouldn't 和 cannot, can't, mustn't 時,例如:
They 'aren't students.
He 'isn't a doctor.
'Don't open that window.
He 'doesn't have a red pencil.
They 'haven't come yet.
He 'hasn't written the letter yet.
l 'shan't go today.
He won't come with me.
l 'cannot speak Spanish.
He 'can't come today.
You 'mustn't do that.
3.)在句尾代表整個謂語部分時(如在普通問句的簡略答語中),例如:
Are you a student? ——Yes, l 'am.
ls she a nurse? ——Yes, she 'is.
Do you have an exercise-book? ——Yes, l 'do.
Does John have a pen? ——Yes, he 'does.
Have you seen him today? ——Yes, l 'have.
Has he come yet? ——l thank he 'has.
Will you call on them today? ——Yes, l 'shall.
Can you speak English? ——Yes, l 'can.
4.)在問句的句首(此情況也可弱讀)和表示驚訝、好奇、憂慮等的問句中,例如:
'ls he a teacher?
'Do they have exercise-book?
Where 'does he work?
'Have you ever been to Hongkong?
What 'have you done?
'Shall we have a group discussion today?
What 'shall we do about it?
'Can you speak French?
'Must l say it in EnglishA?
What 'can we do about it?
感嘆句的重音:
what 和 how 一般都有句子重音,例如:
'What 'lovely 'weather we are having!↘
'How 'happy we are!↘
'How 'hard they work!↘
但 what 在下列省略句中不重讀,以突出強調它後面的 beautiful 這個詞:
What 'beautiful weather!↘
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