Have an enjoyable weekend.<br/><br/> As we all know, (question word + to-infinitive) can be used as a <i>noun</i> or <i>complement</i>. There is no doubt about it. For instance:<br/><br/>1. Please tell me <u><b>how</b> to operate the machine</u>.<br/><br/>2. This is <u><b>where</b> to do your work</u>.<br/><br/>3. Have you decided <u><b>what</b> to do</u>?<br/><br/>However, my question is whether there is any possibility that (question word + -ing or -ed phrase) is used as a <i>noun</i> or <i>complement</i>. For example:<br/><br/>1. Please tell me <u><b>how</b> operating the machine</u>.<br/><br/>2. Please show me <u><b>what</b> completed</u>.<br/><br/>3. This place is <u><b>where</b> sleeping</u>.<br/><br/>Thank you.