<h3>Who <font color="#0000ff"><u>do</u> you guess</font> it was?</h3><h3>Who <font color="#0000ff"><u>did</u> he guess</font> it was?</h3>Are they all correct sentences?<br/><h3>What <font color="#0000ff"><u>does</u> he say</font> he gave her?</h3><h3>What <font color="#0000ff"><u>did</u> he say</font> he gave her?</h3>Are they all correct sentences? They are different only in tense, right? Thank you!