Change the tense of a conditional sentence in reported speech?

[Dphvu]

Hi, I am so confused when doing such kind of exercise. When we change a normal sentence in reported speech,we often change the tense when the tense when the introduction clause in past tense. Do we change the tense of a conditional sentence like others????

[Alan]

Hi Dphvu,

Give us an example of a conditional sentence to see how this can be changed to reported speech. In the mean time you might like to look at this:http://www.english-test.net/lessons/6/index.html

Alan
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English as a Second Language
You can read my ESL story A day in the life of a stately home owner

[Dphvu]

How can we change the following sentences into reported speech:
1/ Tom said "If I pass the exam, I will offer you a big gift for your help"
2/ Anna said "If I were Mary, I would study much better"
3/ John said "If I hadn't been drunk last weekend, I would have gone to the party"

Thanks for your help!

[Cisco795]