英文文法（20點）thx！

1）This is a picture painted about 200 years ago.（過去分詞在名詞後）

2）This is a painted picture about 200 years ago.（過去分詞在名詞前）

First of all, "painted" in sentence (1) is a past participle.It is passive voice.
If you write the sentence in detail, it will be " This is a picture (which was)
painted about 200 years ago." But, in general, we always take away " which
was/is (be) " because of convenience or ellipsis. So, you should pay attention
to this point from my point of view. Sentence (1) is gramatically correct.

Second, "painted" is not a past participle . It has been changed into
an adjective. If you put "painted" in that place,it implies that you try to describe a picture which is painted with something like colors. Definitely,
sentence (2) is gramatically correct.

1）He himself did it.

2）He did it by himself.

" By " is used to accentuate the subject who does the action. In sentence (1),
the formation of " himself " shows that carries the same effect (accentuate the subject who does the action) .So,whether using "by" depends largely on your choice.

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In sentence 1, the phrase "about 200 years ago" is used to modify the word "painted'. It tells us when the picture was painted.
Therefore, it is grammatically correct.

2010-01-01 15:43:38 補充：
In sentence 2, the phrase is used to modify the clause "this is a painted picture".Then, the word "is" has to been changed to "was'. The meaning of the sentence is "about 200 years ago, it was a painted picture. Now it is not."

This is a painted picture.........PAINTED是分詞participle的.p.p.過去分詞作 adj 去形容picture.



about 200 years ago.......整句phrase修飾句前[ 已 ( 被劃好 ) 的圖畫].......在這[短語phrase]內的AGO( adv )只是形容二百年.adv是容許在prep. phrase內作說明. 跟句前的picture完全無關.

wilsonkahin 認為第二句的文法正確，這一點我有保留。你如何解釋 picture 後面的 phrase "about 200 years ago"？如果認為這 phrase 是 adjective phrase 形容 picture，那麼 ago 這個字便用錯了吧？