Question

Had he ________ the importance of the meeting, he would have made sure to attend.

• A. known
• B. knew
• C. knows
• D. knowing
  \bigskip

Hint:

In conditional sentences starting with "Had," always use the past participle form of the verb.

Answer 1

The Correct Option is A

Step 1: Sentence Construction
The sentence employs a conditional clause initiated by "Had he," signifying the subjunctive mood. 
Step 2: Appropriate Verb Tense 
Following "Had he," the past participle "known" is mandatory for constructing the past perfect subjunctive. 
Step 3: Evaluation of Alternatives 
- "knew" represents the simple past, which is unsuitable in this context. 
- "knows" denotes the present tense, rendering it incorrect. 
- "knowing" functions as a gerund or participle, making it inappropriate. 
Outcome: 
The correct construction is "Had he known."