choose the best word?

If they----that the weather was going to be so bad, they wouldn’t have gone to the beach.
Were knowing/had known/known/knew

my answer is known

No.

if they knew that---the answer is knew bc the other side is have+pp

am i right?

Yes, but had known would be better.

thanks for help

You are very welcome.

The correct word to fill in the blank in this sentence is "known." To determine the correct answer, let's analyze the sentence structure and the context.

The sentence is in the past conditional tense, which indicates a hypothetical situation or a condition that did not happen. In this case, the condition is related to the weather, and the result is that they wouldn't have gone to the beach if they had known the weather would be bad.

To express this idea in the past conditional tense, we use the past perfect tense (had + past participle). In this case, "known" is the past participle form of the verb "know." Therefore, the correct word is "known."

To come to this conclusion, you need to understand the grammar rules for forming the past conditional tense and the usage of verb tenses. By understanding these rules and applying them to the sentence, you can determine the correct word in context.