Present perfect tanse

Present perfect key words have two maings
Key words that appear in the sentence
S+have/has+ alredy,just,never ,ever, still+ V3 /ed + ob
ALREADY-- already means action that have been done long before the moment of speaking
F:l have already cleaned room
JUST -- Based on or behaving accordingto what is morally right and fair
1) It refers to an action that was complated a while ago
F: I have just cleaned room
NEVER--At no time in the past of future,not ever
It is used only in negative sentence ,it is not used in negative sentence
F: l have never cleaned room
EVER--At any time .It used in interrogative and indicative sentence
F:l have ever see Ann
STILL--Still it is used only in indicative sentence
F:l have still learning English.
KEY WORDS 2
Key words that come at the end of the sentence
S + have /had + V3/ed + ob + recently ,lately ,yet , since, for, today ,this( morning ,week ,year) so for,by now ,up tomorrow,for ages,
RECENTLY-- At a recent time not long ago .It is used in relation todays and weeks
F:l have finished book recently
LATELY--Recently ,not long ago .It is used in reference to months and years
F: We have bought this car lately .
SINCE--In the intervening period between (the time mentioned) and the time under can sideration typical the present .I tells when the action started
F:Since spring.
FOR--Preposition with the object or purpose of . It shows how long the action has been going on
YET-- Up until the present or a specified or implied time by now or then .It is only used in negative sentence
F;We hevent translated text yet.
Today ,this morning,week,this month , this year keywords
The above words are the key words of Present Perfect and past simple