Hi,<br/><br/>Are these sentences natural to a native ear?<br/><br/><span style="color:#0000ff;">1. Is it normal that the installation is taking this long?</span><br/><br/><span style="color:#0000ff;">2. I reviewed the presentation quickly and have left some notes for you. ( I am not sure if I can use two tenses in the same sentence)</span><br/><br/><span style="color:#0000ff;">3. These headphones are weird; they go so much into your ears that sometimes some wax comes out.</span><br/><br/>Thanks,<br/>MG