The time adverbial in the present perfect tense has nothing but ever

be is the present perfect tense form of be, when a sentence in the present perfect tense needs to use be as a predicate, when to use been, this is not something with special usage, it is the basic grammar that is so standard that it cannot be more standard, what else to explain?

Be is the present perfect form of the verb be in the present perfect tense, i.e., am, is, are should use be instead of the original form in the present perfect tense.

1.Concept: Sixiang pants indicate the actions that often occur at this stage or a certain situation that is now present, and also indicate objective facts, objective laws or objective truths. The predicate verb should be in the original form of the feast, and when the subject is in the third person, the predicate verb should be in the third person singular form.

2.Common time adverbial signs: always, often, sometimes, usually, every day, on sundays, once a day week month, etc.

For example: <>

i do some exercise every day.I do some exercise every day.

she knows french and german besides english.In addition to English, she also understands French and German.

the sun rises in the east.The sun rises in the east.

The time of the dead is used 1 point in the past in relation to the present recently, lately, already, yet, before, still

2 frequency time related to the present ever, never, once, twice, three times, several times, often, seldom, always, time and time again

3 Present dot time related to the past just, now, today, tonight, this week, this year

this morning,this afternoon,this evening,this month,this may,this october,this november

1. If you want to emphasize when the action is grandiose and rotten (ever)since

2 If you want to emphasize how long the action lastfor(a day,several months,many years,how long) for( two hours,six months,quite a long time).

3. If you want to emphasize the overall time: all (morning,night,day,year,these years,my life)all(the while,these days,these ten days)

4 If you want to emphasize the period of time related to the past to the present, up to the present, till now, until now, so far, in the last few years, in the past 30 years ,these days, these weeks, these years