Question

I decided to stay at home last night i would have gone out if i __________ so tired.

Answer 1

I decided to stay at home last night I would have gone out if i was so tired.

Answer 2

I decided to stay at home last night, I would have gone out if I "hadn’t been" so tired.

Explanation:

To make a phrase look appropriate and sound properly, it is important to understand and study all about Tense. Without proper knowledge of tense, we can’t make a phrase with what one has to convey.

Here, "I decided to stay at home last night", is a phrase narrating the present past tense with "I decided" to "last night". Then, "I would" which means that could probably happen. Lastly, I would have gone out if I "hadn’t been" so tired, implies the past tense. Hence, we complete the phrase by adding "hadn’t been" as it gives a clear idea claiming past tense.