Fill in the blanks in the following sentence :
"If I _____ that you were coming today, I would have met you at the station."

Question

Accepted Answer

The correct answer to fill in the blank in the sentence "If I _____ that you were coming today, I would have met you at the station." is Option 3: "had known."

1. **Explanation for Option 3 ("had known"):**
   - The sentence is structured as a conditional sentence, specifically a third conditional. Third conditional sentences are used to talk about hypothetical situations in the past that did not happen. They are formed using "if" + past perfect tense in the if-clause, and "would have" + past participle in the main clause.
   - In this sentence, "If I had known" is the correct past perfect form needed to express the hypothetical situation of knowing about the arrival in the past. The main clause "I would have met you at the station" indicates the action that would have occurred if the condition had been met.

2. **Explanation for why other options are incorrect:**
   - **Option 1 ("knew"):** This is the simple past tense. It is not suitable for third conditional sentences, which require the past perfect tense in the if-clause. Using "knew" would imply a second conditional, which is used for hypothetical situations in the present or future, not the past.
   - **Option 2 ("know"):** This is the present tense. It is incorrect for this sentence because it does not match the past hypothetical context required by the third conditional structure.
   - **Option 4 ("had knowed"):** This is grammatically incorrect because "knowed" is not a valid past participle form of "know." The correct past participle is "known," which is used in Option 3.

In conclusion, Option 3 "had known" correctly fits the grammatical structure of a third conditional sentence, making it the appropriate choice for expressing a hypothetical situation in the past.