simple sentence

[Zoe2008]

I did not apply for this seminar, but forwarded it to Irene to see whether she is interest or not

[David L.]

This is an informal communication, so you could use a contraction (which is easier on the English ear - Americans seldom seem to use them.)

This is colloquial speech:

I didn't apply for this seminar (myself), but I sent it on to Irene to see if she was interested or not.

This is formal speech:
I did not apply for this seminar (myself), but I did forward it to Irene to see whether she is/was interested.


'is/was' depends on whether the seminar has been held or not.