Page 60 - Grammar & Vocabulary

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1 โครงสรางประโยค Present Perfect
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บอกเลา
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Active voice : S + have/has + V3.

-> She has finished homework. / We have studied for 3 hours.
-> His sister has been a nurse since 2010.

Passive voice : S + have/has + been + V3.

-> The report has been completed by them.

ค าถาม

Active voice : Have/has + S + V3? / Wh- + have/has + S + V3?

-> Has she finished homework? / Have they studied for 3 hours?
-> Has his sister been a nurse since 2010?

-> Where have I left my umbrella?

Passive voice : Have/has + S + been + V3?

-> Has the report been completed by them?

ปฏิเสธ
Active voice : S + have/has + not + V3.

-> She hasn’t read textbooks. / We haven’t read novels.

-> His sister hasn’t been a university student.

Passive voice : S + have/has + not + been + V3.
-> The report hasn’t been completed by them.

2 หลักการใช Present Perfect
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 ใชกับเหตุการณที่เกิดขึ้นในอดีต ใชกับเหตุการณที่เกิดขึ้นในอดีต และด าเนินมาถึงปั จจุบัน
้
์
์
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(มักมีค าวา since หรือ for อยูในประโยค)
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่