2 and 6 are incorrect.

1. It is as hot today as it was yesterday. GOOD 2. It is as hot today as was yesterday. INCORRECT 3. It is as hot today as yesterday. MAYBE OKAY, BUT WEIRD 4. Today is as hot as yesterday was. MAYBE NOT TECHNICALLY WRONG, BUT VERY UNNATURAL 5. Today is as hot as yesterday. OKAY 6. Today is the same being hot as yesterday. INCORRECT

5

You must be a Beijinger, with all that talk of heat

你好 Song I am Ekta I'm actually a hindi community tutor, but can help you with spoken English. I'm not allowed to teach English as all the English slots were occupied. So I can offer you 30min or 1 hr session for free. Looking forward! 谢谢