‘I think we will finish this in one or two hours.’
‘Well, I will need to go in about ten minutes.’
‘But we need to finish this thing today.’
‘I understand that. But I’m not staying here any longer. I need to leave shortly.’
‘Why can’t you stay longer?’
‘Because.’
‘Because what?’
‘Because I have other things to do.’
‘Like what?’
‘What is this, an interrogation? I’m telling you that I have other things to do.’
‘OK, I was just asking. I am curious to know what can be so important that you cannot stay here a little longer and help me to finish this.’
‘I am here much longer than I should already! And I was here longer yesterday, and the day before yesterday.’
‘So you could stay here longer today as well.’
‘No. I couldn’t and I won’t. I’ll be here again on Monday to help you, but there are other people waiting for me and I can’t be late.’
‘OK, whatever. If you need to go, just go.’
interrogation /ɪnˌterəˈɡeɪʃn/ – výsluch, vypočúvanie
I have other things to do – mám iné veci na práci
curious /ˈkjʊəriəs/ – zvedavý
as well – tiež
Sparrow's English Reader 