英文Conditional Sentences用法

conditional sentence 中文是條件句。

conditional sentence 有四種，分別是 0, 1, 2, 3。

conditional sentence 0
關於事實，大自然世界，常識，係一定會發生。
e.g. If I heat the ice, it melts.
意指: 如果我燒或者弄熱個冰，它會溶。

由於這是一個常識，是事實，必然會發生，所以動詞會係 simple present tense.
而當中，個兩句句子 (If I heat the ice 和 it melts) ，呢兩句個動詞係 simple present tense (heat 和 melt 冇用到其他tense，而是用 simple present tense e.g. melt --> melts)

即是是被動句，亦是用 simple present tense.
e.g. If the ice is heated, it melts.
意指: 如果個冰被燒或者弄熱，它會溶。

"is heated" 都是 simple present tense, 不過你見到的 heated, 由於被動句的形式係: verb to be (is/am/are) + p.p (動詞第三種形式)，所以具體來說，兩邊句子用 simple present tense 是沒錯的。

所以 conditional sentence 0 個句子結構係:
if ___(simple present tense)____，_____(simple present tense)______.


conditional sentence 1
可能會發生，但不是如事實一樣一定會發生，簡單來說，即是會發生的機會很大，但不是一定。
e.g. If my boyfriend invites me to be his partner, I will go with him to the party.
意指: 如果我男朋友邀請我做佢嘅舞伴，我會跟他一起參加個派對。

由於我男朋友邀請我去跳舞，即使我答應，可能會因為一定緊急事而唔去，所以即使我會去嘅機會率好大，但唔代表我"一定"可以抽到空去，存在一啲未知嘅可能性。不過，大多數，呢啲句子，較為普通嘅，都會用sentence 1。

另外，因為呢個唔係一個絕對，唔係事實，常識等，所以佢會係第一個句子( If my boyfriend invites me to be his partner) 用simple present tense (invite --> invites) , 而後面個句子( I will go with him to the party) 就用 future tense (go --> will go)。順帶一提，表示將來的不一定是 will, 可以是 is going to 等的字，不過is going to 會發生的機會大大過 will 。

所以 conditional sentence 1 嘅句子結構係:
If ___(simple present tense)___, ____(simple future tense)___.


conditional sentence 2
係一啲好抽象，近乎完全冇可能，松會率極微。
e.g. If I won the six marks, I would travel around the world.
意指: 如果我中了六合彩，我會去環遊世界。

我相信即使我每日都去買六合彩，我都唔會中頭獎吧... 所以一看，這是不可能的事，不是不會發生，而是發生的機會是0.00000000001% 吧... 所以呢啲一睇就知冇可能，又有啲誇張嘅，現實唔多會發生嘅就用 conditional sentence 2。

從上面就可以知，因為發生的機會唔大，所以我咃會將第一個句子 ( If I won the six marks) 嘅動詞用past tense (win --> won)，而第二個句子( I would travel around the world) 嘅動詞會用 would / could / might... + verb (travel --> would travel)

所以個句子結構係:
If ___ (simple past tense)___, ____ (would / could / might ... +verb) ____.

2013-10-11 20:10:00 補充：
sorry, 佢唔卑我繼續打...
若果你唔介意，可以給我你的 e-mail 嗎? 方便我解釋埋conditional sentence 3 和一些要注意的事項。

係有四種

Type 0
about facts
If (simple presnt) , (simple presnt).
e.g. If ice is put under sunshine, it melts.

Type 1
possible things
If (simple present) , (simple future).
e.g. If it rains tomorrow, I will stay at home.

Type 2
imaginary
If (simple past), (would + verb).
e.g. If I were you, I would study hard.

Type 3
thing happen in the past 馬後炮
If (past future) , (would have + verb in p.p. form)
e.g. If I had taken a taxi, I would have arrived.

Conditional sentence 3
IF + past perfect,…, . would have + past participle

談論過去可能發生, 但事實上沒有發生的事, 條件那句 (If-clause)用過去完成式時態 (past perfect), 主句用 would have, could have, should have, 或 might have + p.p.
If she had proposed to me, I would have accepted him.
(“事實他當時沒有勇氣向我求婚”)

Thanks, Jo.

2013-10-12 05:17:23 補充：
Correction:
If HE had proposed to me, I would have accepted him.

I'm daydreaming!

conditional sentences既意思系條件句

系可以黎形容當佢達到目的，佢會點做？

e.g.:

if i become a pilot,i will fly plane.


if......呢句系條件子句（conditional clause)，姐系話自己唔能夠成爲一句句子。

而逗號後面既句子系主句(main clause)，自己能夠獨立成爲一句句子。