1 My started studying maths at 4 o'clock. She is still studying it. My sister maths since 4 o'clock. 2 Jane is really selfish she doesn't like anyone else Jane is really selfish she only 3 My mum started cleaning the windows after lunch. Four windows are clean already. My mum four windows since lunch 4 It is a long time since Kate emailed me. Kate hasn't a long time. 5 Tom can take care of himself. Bill can take care of himself, too. Tom and Bill can both 6 Nobody helped us we did it on our own Nobody helped us we did it