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[英文] Verb (Present perfect tense) 動詞(現在完成式)

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(1) When an action began to happen in the past and just finished at the time we are speaking or writing the sentence, we use "Present Perfect Tense" for the verb.
( G2 ~- t( K3 W/ a6 h6 Z* Z" d8 S當一個動作在過去開始了,而且在我們描述句子時,該動作是剛剛完成的,我們便用「現在完成式」。
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$ w3 |8 ?' o* X+ G6 F$ tFor example 例如:9 r; b+ P% ?' `7 A
Dad has just finished his work.
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( E( c, g2 t! i1 G* O(2) When an action began to happen in the past and is till going on now at the time we are speaking or writing the sentence, we can also use "Present Perfect Tense".$ e* [2 a9 i) _( D
當一個動作在過去開始了,而且在我們描述句子時,該動作是仍然在進行的,我們也可以用「現在完成式」。
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9 J5 ~8 ^# ?4 X$ h- [1 h$ MFor example 例如:
( V6 k: N/ t) ~% t% HI have lived in Hong Kong for 10 years.& L* ?: o+ Q% f+ b
My mother has gone home.( G9 Z% `7 }. W- `! L

7 s' j6 B: ^* W(3)To use this tense, we add the word "has" or "have" before the verb and we change the verb to its "past participle" form.
2 x' }$ L/ z; y& @0 }使用「現在完成式」時,我們要把動詞變成「過去分詞」(past participle),以及在「過去分詞」的前面加上 "has" 或者 "have"。4 ]' C4 B6 c( `4 ^! l
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For example 例如:- ^6 e& g& h/ x3 m
Jimmy has done his homework.3 T' k  x$ P& z$ S/ _1 P
We have finished the English test.
7 `( K6 N. S4 m# Y" SShe has gone to her ballet class with her mother.7 z  E! s" Z' H  ^; u( k; e; Q
They have visited the museum. - b, y2 J1 \* h4 v9 R( Y

' e1 o( v  Z( j1 Y4 \Note: What is the "past participle" of a verb? For most of the verbs, you just have to add "ed" at the end to change it into "past participle". For the others (i.e. irregular verbs), you may look up in your dictionary or check it out in this link. 9 g& k3 Y+ T! c$ E6 I. h& [$ l
想知道某動詞的「過去分詞」是甚麼?大部分動詞的「過去分詞」只是在動詞的最尾加上 "ed",至於其他(即不規則動詞),你可查一下你的字典或按此瀏覽/ a/ |6 f& V5 U; o- w
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(4) How to form questions and negative sentences in "Present Perfect Tense"?; S) x* c. q( }
如何以「現在完成式」組成問句和否定句?
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For example 例如:0 Y3 F) E, S8 b3 j) @
Questions:
/ z4 D+ j  W- N1 E% ]$ cHas Jimmy done his homework?4 N$ h. j: U9 n: k& ^' a7 Y
Have we finished the English test?
& R0 l) q# c5 ~/ |; Z  ^+ fNegative sentences:
4 E9 t+ Z9 P2 [She has not gone to her ballet class with her mother.  X  L& F& F# ^# p, D( E
They have not visited the museum.         
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