1.現在分詞與過去分詞的區別：
表示情感的及物動詞如excite, discourage, disappoint, encourage, inspire, interest, move, please, puzzle, surprise, worry等，其分詞常加上後綴-ing或-ed轉化爲分詞（也可稱爲形容詞），用作表、定、狀或補語。在這種情況下，分詞主要體現了語態的不同。現在分詞有主動意味，含有“具有令人……的特性”的意思；而過去分詞有被動意味，含有“受到影響而感到……”的意思。例如：
In Aswan, there are plenty of interesting places to visit. 阿斯旺有許多值得一去的地方。
Some people whose lives are full are always interesting to talk to. 有些人的生活經歷豐富，與他們交談總是令人感興趣的。
If I can find you any support, would you be interested? 假如我能爲你找到資助，你對此有興趣嗎？
但是，由不及物動詞轉化而成的分詞作形容詞時，則體現了時態的不同。現在分詞表示該動作正在進行，而過去分詞表示該動作已經完成。例如：
The woodcutter was standing next to a fallen tree. 那個樵夫站在一棵伐倒的樹旁。
fallen leaves落（在地上的）葉（比較：a falling leaf一片飄落的樹葉）
boiled water（煮）開（過的）水（比較：boiling water沸騰着的水）
the risen sun升得老高的日頭（比較：the rising sun初升的太陽）
現在我來回答你的具體問題。
dog是Barking動作的發起者，表示主動關係。自然就沒有barked dogs這一說法了。
我們可以說I lost a chance yesterday.反過來也可以說A chance was lost yesterday.所以說chance是lost的承受者，表示被動關係。想通了麼？
自然就沒有losting chance這一說法了。
這個消息很激動人心。是說這個消息“具有令人激動起來的特性”，於是它就表示主動了嘛。
學生們很激動。是說他們“受到什麼影響而感到激動”，這樣它就表示就是被動了哦！
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現在分詞和過去分詞主要差別在於：現在分詞表示“主動和進行”，過去分詞表示“被動和完成”(不及物動詞的過去分詞不表示被動，只表示完成)。分詞可以有自己的狀語、賓語或邏輯主語等。
1)分詞作狀語分詞在句子中作狀語，可以表示時間、條件、原因、結果、讓步、伴隨等。分詞做狀語時，它的邏輯主語與句子的主語一致。作狀語的分詞相當於一個狀語從句。
【例如】
Hearing the news, they all jumped with joy. Using what you know of word stems and word formations, you can make a guess at the meaning of a new word.
The students went out of the classroom, laughing and talking. Accompanied by his friend, he went to the railway station.Given better attention, the plants could grow better.
He looked tired and depressed, visibly disturbed by the news of his mother's illness.
分詞在句子中作狀語，使用何種分詞，要取決於分詞與句子主語的關係：主謂關係用現在分詞，動賓或被動關係用過去分詞。
【例如】
Notshavingsenough hands, we turned to them for help.(we don't have enough hands).
Taught by mistakes and setbacks, we have become wiser and handled our affairs better. (we are taught/teach us) .Inspired by the International, the working people of all countries have been fighting for their final liberation. (the working people were inspired/ inspire the working people)____the earth to be flat, many feared that Columbus would fall off the edge. (CET-4 1996,6)
A)shavingsbelieved B) Believing C) Believed D) Being believed
本句意思爲：相信地球是平的，許多人擔心哥倫布會從邊上掉下去。許多人與相信之間是主謂關係，及分詞與主語之間爲主謂關係。因此，應用現在分詞，答案爲B.
No matter how frequently ____, the works of Beethoven always attract large audiences. (CET-4 1995,6)
A) performing B) performed C) to be performed D) being performed
本句中貝多芬的作品被反覆表演，可見分詞與句子的主語之間是被動關係，應該用過去分詞，故答案爲B.
____as it was at such a time, his work attracted much attention. (CET-4 1996,1)
A) Being published B) Published C) Publishing D) To be published
本句中as引導的是讓步狀語從句，意思爲：他的作品儘管在被這樣的時候出版，還是引起了關注，可見分詞與句子的主語之間是被動關係，應該用過去分詞，故答案爲B.
2)“while ( when, once, until, if , though等連詞)＋分詞”結構現在分詞或過去分詞作狀語時，有時可以在分詞前加while，when, once, although, until, if等連詞。
【例如】
When leaving the airport, she waved again and again to us.While waiting for the train, I had a long talk with my sister about her work..
Once recovered, he threw himselfsintoshis work and made every effort to do it well.
Although working very hard, he failed to pass the final exam.If translated word by word, the passage will be difficult to understand.
3)分詞作定語分詞作定語時，單個的分詞通常放在被修飾的名詞之前，分詞短語一般置於所修飾的中心詞後面。現在分詞修飾的是發出該動作的名詞(即與名詞有主謂關係)，過去分詞修飾承受該動作的名詞(即與名詞是動賓關係)。
【例如】
We will go on with our experiment as soon as we get the added fund.
This is really an exhausting day to all of us!
We can see the part of the moon lighted by sunlight.
After a night spent in excitement and sleeplessness, I forced myself to take a long walk along the beach the next day.
More and more developing countries established strategic partnership with developed countries.
The young sitting between my sister and my brother is my cousin Jack..
As early as 1649 Ohio made a decision that free, tax-supported schools must be established in every town ____50 households or more. (CET-4 1998,1)
A)shavingsB) to have C) to have had D)shavingshad Town
後面由分詞做定語，而且town本身有50或以上人家，故town與分詞間爲主謂關係，應該用現在分詞，答案爲A。
4)分詞作賓語補足語現在分詞在see, watch, hear, observe, notice, feel, find, glimpse, glance等感官動詞和look at, listen to等短語動詞以及have, keep, get, catch, leave, set, start, send等使役動詞後面與名詞或代詞構成複合賓語，作賓語補語的成分。
【例如】
On the top of the hill, we could see smoke rising from the chimneys in the village.
The little boy sat beside the railway line and watched the trains roaring by.
We should not leave him wondering what he should do.
I am sorry to have kept you waiting for such a long time.
I caught him dozing off in class.
過去分詞可以在allow, ask, consider, desire, expect, feel, find, get, have, hear, imagine, keep, like, make, observe, order, permit, prefer, remember, request, require, see, urge動詞等後面作賓語補足語。
【例如】
After my encounter with her, I found myself greatly shaken.You should keep her informed of what is going on here.The teacher expected the students well prepared for the examination.
在動詞see, hear, feel, watch, notice，perceive，observe, listen to, look at後既可用現在分詞做補語,也可用不定式做補語。用現在分詞表示動作正在進行,用不定式表示的動作的全過程已經完成。
【例如】
I saw Mr. White get off a bus.
I saw Mr. White lookingsintosa shop window.
——Do you hear someone knocking at the door?
——Yes, I did. I heard him knock three times.
5)分詞作表語分詞作表語通常看作形容詞來用。現在分詞表示主語的性質，而且主語多爲物；過去分詞表示主語的感受或狀態，主語多爲人。
【例如】
The film“Pearl Harbor”is really exciting. I am excited about it.
His response to the question was quite disappointing. I felt disappointed at his response.