Prtesent perfect

Present perfect , past , present perfect continuous de tod oesto, diferences, auxiliaries and time expressions
What is difference between the present perfect tense and the present perfect continuous tense?
The difference between the present perfect tense and the present perfect continuous tense is very small. There are many times when the two tenses can be used interchangeability. There aredifferences in the structure of the tenses. The two tenses use the auxiliary verb "have". The present perfect tense -ed is added to the main verb and the present perfect continuous tense -ing is added to the main verb and the verb "to be" is also used.
The Present Perfect Tense vs. the Present Perfect Continuous Tense |
Present Perfect Tense | Present Perfect Continuous Tense |
* to statean action that was not continuous or was interpreted | * to state an action that is continuations |
* to state the amount of times an action took place | * to state the length of time or to state "how long" the action took place. |
- | * to emphasize the period of time the action took place |

Time Expresions: -Once a day/ Week/Month/Year. -Three/four... times a day/ week/ month/year. -Twice a day/ week/ month/ year. -Every day/ week/ month/ year. -From monday to friday . *Once a Day: Three times a day: Twice a day: PRESENTE SIMPLE Always, usually, occasionally, frequently, often, someties, rarely, seldom, never, once month, every week, in the morning, at three o’clock, on Mondays, at night, how often?.
PRESENT CONTINUOUS. Now, right now, at the momen, today, these day,this month/year, at present, tonight,tomorrow, this afternoon, next Sunday/week/month.
PAST SIMPLE: yeterday, last year, two days ago, in 2004, when, then.
PAST CONTINUOUS: last night/week/ year, at nice o´clock, when and, while,as.
PRESENT PERFEC SIMPLE: ever, never yet, just, already, recently, lately, how long?, since for.
PAST PERFEC SIMPLE: already , by the time, aafter, befote, until,never, just.
FUTURE SIMPLE: this evening, later, next month, soon, al eleven o’cloc, in an hour, tomorrow, in a few weeks, on the 8th of may, in the future.
FUTURE CONTINUOUS: at this time, tomorrow, at this time text, on Thusday, in the next decades.
FUTURE PERFECT: by this time next week, by ten o’clock , by the end of…by then, by August, in two months.
* ...when I was younger.
*...for many years.
* ...this time next week.
* ...at(on) weekends.
* After he finishes his homework,...
* By the time you receive this letter,...
* ...three years ago.
* ...this week.
* ...since 1996.
* ...while I was watching TV.
* ...next year.
* ...yet.
* ...yet?
* Usually,...
* ...in June.
Simple Past
[VERB+ed] or irregular verbsExamples:
* You called Debbie.
* Did you call Debbie?
* You did not call Debbie.
Complete List of Simple Past Forms
USE 1 Completed Action in the Past

Use the Simple Past to express the idea that an action started 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:
* Isaw 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.
USE 2 A Series of Completed Actions

We use the Simple Past to list a series of completed actions in the past. These actions happen 1st, 2nd, 3rd, 4th, and soon.
Examples:
* I finished work, walked to the beach, and found a nice place to swim.
* He arrived from the airport at 8:00, checked into the hotel at 9:00, and met the others at 10:00.
* Did you add flour, pour in the milk, and then add the eggs?
USE 3 Duration in Past

The Simple Past can be used with a duration which starts and stops in the past. A duration is a longer...