Hi, I have some English questions. I would be appreciated if you could answer them.
1. Is this sentence correct or could you please change the sentence to sound natural?
'The reason why I didn't go out was because the weather was not good.'
2. Can I say 'leftover' for the stuff instead of food?
For example,
'I have some leftover gifts.'
3. Are these correct to write in a business email?
'I'm sharing the file as the attached.'
'Please refer to the attached.'
'Please refer to the attached file.'
Thank you