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ข่าวสารแพทย์นาวี : Naval Medical Newsletter
โครงสร้าง passive voice ในแต่ละ tense มีดังนี้ค่ะ
1. Present simple tense
Active : S + V1
Passive : S + is / am / are + V3
ตัวอย่างเช่น
Active : John writes a book.
Passive : A book is written by John.
2. Present continuous tense
Active : S + V. to be + Ving
Passive : S + is / am / are + being + V3
ตัวอย่างเช่น
Active : John is writing a book.
Passive : A book is being written by John.
3. Present perfect tense
Active : S + have / has + V3
Passive : S + have / has + been + V3
ตัวอย่างเช่น
Active : John has written a book.
Passive : A book has been written by John.
4. Present perfect continuous tense
Active : S + have / has + been + Ving
Passive : S + have / has + been + being + V3
ตัวอย่างเช่น
Active : John has been writing a book.
Passive : A book has been being written by John.
5. Past simple tense
Active : S + V2
Passive : S + was / were + V3
ตัวอย่างเช่น
Active : John wrote a book.
Passive : A book was written by John.
6. Past continuous tense
Active : S + was / were + Ving
Passive : S + was / were + being + V3
ตัวอย่างเช่น
Active : John was writing a book.
Passive : A book was being written by John.
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