Tense

simple present tense

fact, things happen /done daily
The earth is round.? England is in Europe? - fact
We go to school at 8 o'clock every day.- things done daily

Present Perfect tense

action has been started for a period of time and finished now.? Action has been started and still continued without a definite date or time or show two action

After I have finished my homework, I go to see a movie with Mary.
I have worked for my boss since last Summer
I have studied in this school for two years.

Past tense

action was done in the past with definite time- yesterday, last week etc.
I visited my grandmother last week.
We went to Japan two weeks ago.
He was born in 1980.
.

Past perfect tense

is used when there are two action happening in the past
We had finished our lunch before Mary came to visit us.
After we had talked to our parents, we went to movie with Mary.

Future tense

simply show action in the future.
I will go to see my grandmother next Sunday
We will go to Japan this coming Summer holiday.
We are going to see my granmother next Sunday.

Future continuous tense

is used to express what we will be doing
I will be going to see my grandmother this time next Sunday.
We will be playing basket about noon tomorro

Future perfect tense

wish or suppose if
If I were you, I would have won the game.
If we were the managers of the restaurant, we would have made a lot of money.