The river (flows/ is flowing) very fast today.
Do you know how to drive? I am learning (to). My father (teaches/is teaching) me.
Normally I finish work at five, but this week I (worked/am working) until six to earn a little more money.
In the above three questions, the choice between continuous and noncontiuous verb was made based on the context. But as a foreign learner of English, I have to a couple of questions;
In the second question is it correct to say 'I am learning to'?
In the second question, I'm assuming that the 'my father is teaching me' refers to learning how to drive. So does that mean that even if his/her father taught him/her something else than driving, it is still appropriate to use 'is teaching' because it is only talking about the driving lesson?
In question 3, what if the time at which the person was talking was on the weekend? Then, should the person say 'worked' instead of 'working'??