question on my CELTA I do not understand. Please help!!

[petit_loup]

Comment on the difference in meaning between the following pairs of sentences, and outline how you might teach these differences in meaning

a) if i become president, I'll lower taxes.
b) If i had become president, i would have lowered taxes.

 

[Raymott]

Comment on the difference in meaning between the following pairs of sentences, and outline how you might teach these differences in meaning

a) if i become president, I'll lower taxes.
b) If i had become president, i would have lowered taxes.

The two sentences mean different things. You'll note that the tense is different. They're asking you to say what the difference in meaning is.
Then, they want you to assume that you are a teacher and say how you would teach what the difference is (between the meaning of the sentences, based on the difference in form).