first conditional ???English ..plx help

Conditional sentence:
type 0: (facts) [If (present tense), (present tense)]
example: If we boil water, it becomes steam.
type 1: (indeterminate = unsure) [If (present tense), (future tense)]
example: If it rains, we will not go out.
tpye 2: (contrary to present fact = not real now) [If (subjunctive past tense), [would/should/could/might + base form verb]
example: If I were rich, I would buy a big house. (= I am not rich, so I do not buy a big house)
type 3: (contrary to past fact = not real in the past) [If (subjunctive past perfect tense), (would/should/could/might + have + past participle)]
example: If I had been rich, I wouldhave bought a big house. (= I was not rich in the past, so I did not buy a house)
Hope this helps!

2008-01-15 00:15:51 補充：
type 0 = [all time] because it is a facttype 1 = [future time]type 2 = [present time]type 3 =[past time]

1) The first conditional (also called conditional type 1) is a structure used for talking about possibilities in the present or in the future.

Information and examples: http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/1cond.htm

2) The second conditional (also called conditional type 2) is a structure used for talking about unreal situations in the present or in the future.

Information and examples: http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/2cond.htm

3) The third conditional (also called conditional type 3) is a structure used for talking about unreal situations in the past.

Information and examples: http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/3cond.htm

4) The zero conditional is a structure used for talking about general truths -- things which always happen under certain conditions.

Information and examples:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/0cond.htm