Question

Fill in the blank using suitable form of verb:
I knew Sarah was very busy, so I ____________ her. (disturb)

• A. didn't disturb
• B. haven't disturbed
  
• C. don't disturb
  
• D. isn't disturbing
  

Answer 1

Answer: (A)

The simple past (also called past simple, past indefinite) is a verb tense which is used to show that a completed action took place at a specific time in the past. We use the simple past to express the idea that an action started and finished at a specific time in the past, here, the action of not disturbing Sarah. The simple past is formed using the verb + ed. In addition, there are many verbs with irregular past forms. Questions are made with 'did' and negative forms are made with 'did not'. Hence, Option B is correct.

The rest of the options do not express this condition. They all mention actions that are happening in the present. Hence these options are incorrect.