咩叫做conditional sentences??

即係條件字句...即係「If xxxxx, I will xxxxx」果d
分為4 類...

type 0 係永恆不變的fact....
條件句同主句都係用present tense..
eg. If we heat the ice, it melts.

type 1 is used when we refer to a probable event to take place now or in the future.
條件句用present tense,, 主句用future tense
eg. If you come into my garden, my dog will bite you.

type 2 講現在/ future 既,, 但發生機會唔大的...
條件句用past tense,, 主句用would xx
eg. If you go by train, you will get there earlier. (睇你都唔會搭train架啦)

type 3 is used when we are referring to a past, impossible case.
過去左, 冇得改變的事....亦即係俗語的「馬後炮」..
條件句用past perfect,, 主句用would + have + pp
eg. If he had started earlier, he would not have missed the train. (已經太遲了,, train 已經開左)

type 2係無可能發分既事
姐係如果我係你果d
eg. if i were you , i would not do that.

條件語句
即是要有一個原先，才能有之後的結果
example:
If you have much money,you can buy your favour.
如果你有錢（這是一個條件），你便可以買你的最愛（這是一個結果）。

This is my explainning for your question.