<i>"Once I have heard back from my former employers <b><u>about whether</u></b> they accept to be my reference, I will call you."</i><br/><br/><i><b><u>1) about whether</u></b> they accept to be my reference= How is this functioning? Adverbial answering what?</i><br/><br/><br/><i>2) What about this version below... Is it still correct? What is this phrase now?</i><br/><br/><br/><i>"Once I have heard back from my former employers <b><u>whether</u></b> they accept to be my reference, I will call you."</i><br/><br/><br/><br/>Thanks