Present Progressive

We use the present progressive to talk about actions which are happening at the present moment, or around the time when we are speaking, but will soon finish.
we use the Present Progressive to express the idea that an action is happening now, at this very moment. It can also be used to show that something is not happening now.
In English, "now" can mean: this second, today, this month, this year, this century, and so on. Sometimes, we use the Present Continuous to say that we are in the process of doing a longer action which is in progress; however, we might not be doing it at this exact second.

Example: I am playing tennis.

PRESENT PROGRESSIVE

Affirmative sentences:

Subject + verb to be + main verb (-ing)

Ex.

I am teaching a class.

You are listening to the teacher.

She is writing a novel.

It is raining right now.

We are traveling to the U.S.

They are going to school.

How tyo make affirmative, negative or interrogative sentences:

Affirmative:  I am speaking to you.
Affirmative:  You are reading this.
Negative: She is not staying in London.
Negative: We are not playing football.
Questions: Is he watching TV?
Questions: Are they waiting for John?

Rules for adding -ing suiffix to the verb:

1) a verb ending in –e, drops the –e and add –ing.
ex.: cruise    cruising

2) a verb ending in –ie, change to –ying.
ex.: lie      lying

3) a 1 syllable verb ending in consonant-vowel-consonant, double the last consonant and add –ing.
ex.: swim     swimming    run   running

4) All other verbs just add –ing.
ex. Play    playing                  read     reading