Tense

1.Present simple
Use the Simple Present to express the idea that an action is repeated or usual. The action can be a habit, a hobby, a daily event, a scheduled event or something that often happens. It can also be something a person often forgets or usually does not do.
Examples:
• I play tennis.
• She does not play tennis.
• Does he play tennis?
• The train leaves every morning at 8 AM.• The train does not leave at 9 AM.
• When does the train usually leave?
• She always forgets her purse.
• He never forgets his wallet.
• Every twelve months, the Earth circles the Sun.
• Does the Sun circle the Earth?
2. Present Continuous
Use the Present Continuous with Normal Verbs to express the idea that something is happening now, at this very moment. It can also be used to show thatsomething is not happening now.
Examples:
• You are learning English now.
• You are not swimming now.
• Are you sleeping?
• I am sitting.
• I am not standing.
• Is he sitting or standing?
• They are reading their books.
• They are not watching television.
• What are you doing?
• Why aren't you doing your homework?

Simple Past
Use the Simple Past to express the idea that an actionstarted and finished at a specific time in the past. Sometimes, the speaker may not actually mention the specific time, but they do have one specific time in mind.
Examples:
• I saw a movie yesterday.
• I didn't see a play yesterday.
• Last year, I traveled to Japan.
• Last year, I didn't travel to Korea.
• Did you have dinner last night?
• She washed her car.
• He didn't wash his car.Past Continuous
Use the Past Continuous to indicate that a longer action in the past was interrupted. The interruption is usually a shorter action in the Simple Past. Remember this can be a real interruption or just an interruption in time.
Examples:
• I was watching TV when she called.
• When the phone rang, she was writing a letter.
• While we were having the picnic, it started to rain.
•What were you doing when the earthquake started?
• I was listening to my iPod, so I didn't hear the fire alarm.
• You were not listening to me when I told you to turn the oven off.
• While John was sleeping last night, someone stole his car.
• Sammy was waiting for us when we got off the plane.
• While I was writing the email, the computer suddenly went off.
• A: What were you doing when youbroke your leg?
B: I was snowboarding.
Simple Future
Simple Future has two different forms in English: "will" and "be going to." Although the two forms can sometimes be used interchangeably, they often express two very different meanings. These different meanings might seem too abstract at first, but with time and practice, the differences will become clear. Both "will" and "be going to" referto a specific time in the future.

FORM Will
[will + verb]
Examples:
• You will help him later.
• Will you help him later?
• You will not help him later.
FORM Be Going To
[am/is/are + going to + verb]
Examples:
• You are going to meet Jane tonight.
• Are you going to meet Jane tonight?
• You are not going to meet Jane tonight.
Complete List of Simple Future Forms
USE 1 "Will" toExpress a Voluntary Action
"Will" often suggests that a speaker will do something voluntarily. A voluntary action is one the speaker offers to do for someone else. Often, we use "will" to respond to someone else's complaint or request for help. We also use "will" when we request that someone help us or volunteer to do something for us. Similarly, we use "will not" or "won't" when we refuse tovoluntarily do something.
Examples:
• I will send you the information when I get it.
• I will translate the email, so Mr. Smith can read it.
• Will you help me move this heavy table?
• Will you make dinner?
• I will not do your homework for you.
• I won't do all the housework myself!
• A: I'm really hungry.
B: I'll make some sandwiches.
• A: I'm so tired. I'm about to fall asleep....