Grammar (The Present Progressive)

        The present progressive expresses an activity that is in progress( is occurring, is happening) right now. The event is in progress at the time the speaker is saying the sentence. The event began in the past, is in progress now, and will probably continue into the future.
                                           Form: am, is, are + ing.
(a) Sara can't come to the phone right now because she is taking shower.
(b) It's noon. I am eating lunch at the cafeteria right now.
(c) Ann and Bob are babies. They are crying. I can't hear them right now. Maybe they are hungry.

Forms of the present progressive.
Statement: I am working.
                   (You- We- They) are working.
                   (He- She- It) is working.
Negative: I am not working.
                 (You- We- They) are not working.
                 (He- She- It) is not working.
Question: Am I working?
                 Are (you- we- they) working?
                 Is (he- she- it) working?

Present Progressive short answers to the questions.
Question: Are you studying?
 
Short answer: Yes, I am.
                        No, I'm not.
Long answer: Yes, I am studying.
                        No, I am not studying.

Short question: Is Sana Studying?

Short answer: Yes, she is.
                        No, she's not or
                        No, she isn't.

Long answer: Yes, she is studying.
                        No, she's not studying. or
                        No, she isn't studing.

Short question: Are they studying?

Short answer: Yes, they are.
                        No, they're not. or
                        No, they aren't.

Long answer: Yes, they are studying.
                        No, they're not studying.
                        No, They aren't studying.   

Grammar (The Simple Present)

                                                            The Simple Present

          The simple present expresses daily habits or usual activities.

(a)    Ann takes a shower every day.

(b)   I usually eat lunch at the cafeteria.

The simple present expresses general statements of fact.

(c)    Babies cry.

(d)   The earth revolves around the sun.

(e)    A square has four equal sides.

(f)     The sky is blue.

In sum, the simple present is used for events or situations that exist always, usually, or habitually in the past, present or future.

Forms of the simple present.

Statement: ( I- You- We- They) works.

                  ( He- She- It) works.

Negative: ( I- You- We They) do not work.

                 ( He- She- It) does not work.

Question: Do ( I- you- we- they) work?

            Does ( he- she- it) work?

Simple Present Short answers to questions.

Question: Does Bob like tea?

Short answer: Yes, he does.

                        No, he doesn’t.

Long answer: Yes, he likes tea.

                        No, he doesn’t like tea.

Question: Do you like tea?

Short answer: Yes, I do.

                        No, I don’t.

Long Answer: Yes, I like tea.

                         No, I don’t like tea.