There are many reasons that she was my favorite teacher of all times.

[嘟嘟嘟嘟]

There are many reasons that she was my favorite teacher of all times, but there is not enough space to share all of these.

Is "that" right to be used in the sentence? Thanks for help!

 

[Matthew Wai]

http://www.ldoceonline.com/dictionary/reason_1
According to the 'COLLOCATIONS' box, both 'reason that' and 'reason why' are correct.

Not a teacher.

 

[White Hat]

Personally, I'd use "why".

 

[konungursvia]

... of all time.

 

[tedmc]

The 'why' in 'reasons why' is actually redundant.
Likewise 'that' could also be done away with.

Not a teacher

 

[emsr2d2]

To clarify, tedmc is suggesting "There are many reasons she was my favourite teacher of all time". Despite the fact that I agree that both "why" and "that" could be redundant, I find that suggested sentence unnatural.

 

[Matthew Wai]

Is it natural to say 'For many reasons, she was my favorite teacher of all time'?

Not a teacher.

 

[emsr2d2]

Yes.