有present perfect tense 既問題一問

你都識講你想強調TOM「曾經有個咁樣既決定」，即係佢"冇做到"並且係過去時間的決定，所以用"現在"的"完成式"便表達不出"已經係歷史的決定"和"其實沒有執行他的決定"，因此要完全表達你講要"強調"的意義便要如下：

Tom decided to provide money for Mary but he never did. [不交代/講出你知"時空"]
或
Tom had decided to provide moeny for Mary (in May) but changed his mind (in Dec) not to do so. [詳細地講出時空和行為]

Tom had decided to provide money for Mary but never did (even until Dec.2020)!!!!!

2015-05-01 03:50:45 補充：
The emphazied on "never had paid"=Tom never had paid (5--12),using the Past perfect.
For Once May 2015:-
After he had once decided to pay for Mary,
Before Mary received the pay,

For Dec 2015--with changed:-
Tom changed and did not pay.
Or Tom never paid (5-12)
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Tom had changed
Or Tom never had paid (5-12)
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In 2020 the future perfect shows a completed action in the future before a point of time,probably will have said the above 2 sentences.

想強調Tom 曾經有個咁樣既決定:

You should use "once" with past perfect tense or simple past tense to show the event happened at some time in the past, but not now:

Tom had once decided to provide money for Mary.
Tom once decided to provide money for Mary.

2015-04-29 02:52:18 補充：
Complete sentence to be said in 2020:

Tom had decided to provide money for Mary once in 2015, before he changed his mind in December 2015.

(A) Tom 是否由今年五月至十一月，每個月提供一筆錢俾Mary？
又由十二月開始改變主意，冇再俾錢？

i)到了2020年，"Tom provides money for Mary." 這件事：
巳過去 、且完成 ---> 應該用 " past perfect tense " ，

ii) 不單是「决定 (decide) 做 」，而是「巳提供 (provide)了錢 (5 -11月) 給 Mary」
---> 所以用 " had provided "

再加上顯示「時間」的字眼去 justify "present perfect tense" ( had provided ) 的應用 --
假設現在是2020年，應說：
" Starting from 1 May, 2015,Tom had provided money for Mary every month. But, he had changed his mind and stopped sending her money from December,2015 "

* * * * * * *
(B) 若Tom 只是想決定由今年五月一日起，每月提供一筆錢俾Mary，但到今年十二月改變主意，唔想提供錢俾Mary
--->即 Tom 從未俾過錢 Mary 。

到了2010年，應說 ：
" Tom had considered providing money for Mary every month from 1 May, 2015. But, he had changed his mind in December, that is, not sending her any money. "