Present Continuos

*The Form present continuous divided by three form:
1)affirmative
2)negative
3)questions and answers

*Use of Present continuous is:
-For actions happening at the moment of speaking,and not finished.
-For continuing,unfinished actions which are not actually happening at the moment of speaking,with the verbs like work, learn, read, study etc.
-For changing situations,with verbs like become, get, grow, change, increase,or with expressions such as more and more.
-For a future arrangement, with a time reference

*Present Simple and Continuous with different meanings such as:
-I think it's a good idea(present simple for opinion)
-I'm thinking about it(Present continuous for action)