Present Countuous

Form
   Positive
Subject + tobe + verb ( ing ) + complement.
  Negative
Subject + tobe + not + verb ( ing ) + complement.
  Question
Tobe + subject + verb (ing) + (complement)
1. Use of the Present Progressive
1.1. actions happening at the moment of speaking

Ex ; Peter is reading a book now.

1.2. fixed plan in the near future

Ex ; We are going to Basel on Saturday.

1.3. temporary actions

Ex ; I am working in Rome this month.

1.4. actions happening around the moment of speaking (longer actions)

Ex ; My friend is preparing for his exams.

1.5. trends

Ex ; More and more people are using their computers to listen to music.

1.6. repeated actions which are irritating to the speaker (with always, constantly, forever)

Ex ; Andrew is always coming late.

2. Signal words
now
at the moment
Look!
Listen!
3. Form
to be (am, are, is) + Infinitiv + -ing