Meaning:
It says that something was true in the past, is true in the present, and will be true in the future.
Form
Affirmative
Simple form
Simple form + -s /es
(with third person singular)
Negative
do + not + simple form
does + not + simple form
(with third person singular)
Examples,Usages
Examples:
A) I live in Riyadh.
B) My age is 18 years old.
C) Tom goes fishing every week.
D) I get up early every day.
Usages:
1. A,B
to express general statements of fact and general truths.
2. C,D
to express habitual or everyday activities.
Indicators:
Always, usually, frequently, everyday, every time, on Sundays, every now and then, once a year, often, rarely, sometimes, generally, never, etc.
Present Progressive
Meaning:
The present Progressive expresses an activity that is in progress at the moment of speaking. It is a temporary activity that began in the past, is continuing at the present, and will probably end at some point in the future.
Form
Affirmative
am/is/are + v-ing
Negative
am/is/are + not + v-ing
Examples,Usages
Examples:
My cat is eating fish.
I am speaking.
Usages:
To express an action or event that is in progress at the moment of speaking.
Indicators:
Now, right now, at this moment, etc.
Indicators:
While, when
Examples,Usages
Examples:
A) When I was watching TV, My mom started calling me.
B) While I was studying in our room, my sister was having a nap.
Usages:
A: When two actions occurred at the same time, but one action began earlier and was in progress when the other one occurred.
B:Sometimes the past progressive is used in both parts of a sentence when two actions are in progress simultaneously.
Past Progressive
Meaning
It indicates that an activity or situation was in progress at a past point in time. The action is often interrupted by a simple past tense verb.
Form
Affirmative
was/were + v-ing
Negative
was/were + not + v-ing
Indicators:
Yesterday, last night, last week, ago, when etc.
Examples,Usages
Examples:
A) I watched TV last week.
B) I played football yesterday.
C) when i reached the maximum daily dose of caffine,my heart started beat.
Usages:
A,B :An activity or a situation that began and ended at a particular time in the past.
C:If a sentence contains when and has the simple past in both clauses, the action in the when-clause happens first.
Simple Past
Meaning:
It indicates that an activity or situation began and ended at a particular time in the past.