We use present continuous in the following situations:
1. To talk about actions that started in the past and continous up to the present.
Ex:"we are working to improve the educational system"
2. To talk about something that is happening at the moment of talking.
Ex: "I'm walking on the street"
3. To describe a future action which is already scheduled.
Ex:"We are traveling to Canada next week"
4. To talk about a long period process that take a change during the time.
Ex:"The number of people in Chile are increasing"
(+)Affirmative: Subject + am/is/are + verb-ing + complement.
(-) Negative: Subject + am/is/are + not + verb-ing + complement.
(?) Interrogative: am/is/are + subject + verb-ing + complement.
Wh-question + am/is/are + subject + verb-ing + complement.
Do not use present continuous with stative verbs.
Here is a list of stative verbs which can help you: https://advancedesl.files.wordpress.com/2011/01/stative-verbs1.jpg