有關英文句子既問題問下

I have swept the floor of my house. I used a broom to sweep the floor.

這兩句子獨立分開地說, 文法是無錯.
第一句是Present perfect tense (現在完成式), 接著句子用 Past simple tense
Jenkin, 什麼是 “現在現成式” ?
英文沒有規定用 past tense 時, 必定有言及過去時間的字眼在那句子, (e.g. yesterday, last week…),許多時, 可能前文已經交待了.

Mary used her computer to do her project yesterday. ~ 無錯

Sorry, Wing 我借用 space to make some comments.

I have used a broom to swept the floor of my house. ~ 錯
句子應該是:
I have used a broom to sweep the floor of my house.

“swept” ~ past tense, past participle
“to” 如果是用作 infinitive marker, to 後面不能加 past tense or past participle, 應用 bare infinitive.
“to” 如果是用作 preposition, 可加 present participle (to + verb-ing)

Jenkin 另外的一句, 我認為都是錯, 只不過錯得沒有那麼明顯.
I have swept the floor of my house using a broom.
“using a broom” 是 present participle phrase, describing …?

Compare:
I have seen the boy stealing an apple.
stealing an apple 是 present participle phrase
你認為應該是言及 “I” 還是 “boy”?

我認為應該是言及最近的 noun (or noun phrase)
句子我會 rephrase:

Using a broom, I have swept the floor of my house.




2014-04-07 00:53:42 補充：
如果句子強調 "我剛掃完了家的地板"

我會這樣寫:
I have just finished sweeping the floor of my [house, flat or apartment].

2014-04-09 05:05:30 補充：
作為一個回答者, 有自由自己喜歡怎樣回答
不過最尷尬是將發問者對的當做錯, 並且解釋到似是而非,
有知識長以前提到, 最弊是發問者將錯的當做對, 因無人指正,
這對發問者是不公平, 雖然是無心之失, 教錯人總是不好.
Constructive criticism 是好的, 我想 Yahoo 知識網目的是分享知識

Regarding the grammatical problems of the following two sentences:
(1) I have swept the floor of my house, I used a broom to sweep the floor.
Amendment: I swept the floor of my house with a broom yesterday.
(2) Mary used her computer to do her project yesterday.
Absolutely correct.

2.-對的

1.原句第一句意思是我剛掃完了家的地板...是現在現成式，又加一句過去式的講用掃把，其實沒必要這樣拆句寫。

假如你想強調剛完成
I have swept the floor of my house using a broom.
假如你想強調掃的方法
I have used a broom to swept the floor of my house.
都是講述剛做完的掃地事件，不用又現在完成式又加一句過去式句等等。

2.-對的

1.原句第一句意思是我剛掃完了家的地板...是現在現成式，又加一句過去式的講用掃把，其實沒必要這樣拆句寫。

假如你想強調剛完成
I have swept the floor of my house using a broom.
假如你想強調掃的方法
I have used a broom to swept the floor of my house.
都是講述剛做完的掃地事件，不用又現在完成式又加一句過去式句等等。

第一題：個swept字係解昨天、前天，還是上星期呢？冇加時間。Careless mistake!
第二題：全對!

無錯，但第一句可用

I swept the floor of my house.