Sentences:<br/><br/>1) All I have to do is <b><i>dream</i></b>.<br/><br/>2) At the height of the financial crisis, all they could do was <b><i>hold on</i></b> and <i><b>hope</b></i> that the situation would improve.<br/><br/>The predicative components of the two sentences are the original form of the verbs. Are they <b><font color="#ff0000">infinitive phrases</font></b> whose <i>to</i> was omitted?<br/><br/><br/><br/>Thanks in advance!