Q2/ show the differences between the sentences

1)
a) I have finished my project
b) I am finishing my project

2)
a) the company receives the engineers' requests for appointments on 9th July.

b) on 9 th July, I am sending my request for an appointment to thecompany.

3)
a)I have been to University of Oxford.

b)I have gone to University of Oxford.

4)
a/she will do away with coffee.
b/ She will do it with coffee.

5)
a)I have been an engineer for 4years
b)I have been an engineer since 2012.