Hi,<br/><br/>Are the following sentences natural to a native ear? <br/><br/><span style="color:#0000ff;">1. I hope I am not taking too much of your time. I have called you unannounced. ( I said this to a peson on the phone)</span><br/><br/><span style="color:#0000ff;">2. I don’t mean to hold you up, if you need to go, let me know.</span><br/><br/><span style="color:#0000ff;">3. He never stays so late, he must have had to work on something important.</span><br/><br/>Thanks,<br/>MG