..........I happened to see this exercise and tried doing it. When comparing with the key answers, I couldn't make out some. Would you kindly explain them for me?
The task is to choose the best prepositions. The ones in red are keys while the underlined are my answers
1. Water was streaming ... the roof. (in, out of, from, off)
'Off' is used to say that something has been removed from somewhere. In this sentence 'water' was removing itself from the roof, so to say.
2. He put the book ... the table and sat down ... a chair. (on-in, on-with, on-on, on-into)
"On" suggests a two-dimensional object, a flat surface. It could also be 'in a chair' if the chair had arms. Then the chair seat would be perceived as a three-dimensional object.
3. She sacrifices her life ... her family (With, for, into, to)
'Sacrifice to' has just to be remembered as such.
4. I began to work here ... January ...the year 1980. (on-in, at-in, in-at, in-in)
In January, in the year 1980 - are understood as time-containers. The event is inside those containers, that's why 'in'.
Thank you very much