Make a sentence from the words in brackets using the appropriate tense: The month of October is going on and you are talking about Ann’s earning of last year.____________________ (Ann / not / earn / so much / last year)

The correct answer is: C. Ann didn’t earn so much last year.

The sentence is about Ann’s earnings in the past, so we need to use the past tense. Option A is incorrect because it uses the present perfect tense, which is used to talk about actions that started in the past and continue to the present. Option B is incorrect because it uses the present tense, which is used to talk about actions that happen regularly or repeatedly. Option D is incorrect because it uses the past perfect tense, which is used to talk about actions that happened before another action in the past.

The sentence “Ann didn’t earn so much last year” is in the simple past tense. The simple past tense is used to talk about actions that happened at a specific time in the past. In this case, the action is Ann’s earnings in the past year.

Here are some other examples of the simple past tense:

• I went to the store yesterday.
• She ate dinner at 6:00 pm.
• We played basketball last weekend.
• They did their homework last night.