" Present Perfect Tense "

Present perfect tense is used for describling a past action effest on the present. This holds true for events thathave not et occured.

EXAMPLE :
# Present perfect is formed by combining have/has with the main verb's past participle form:
=> He has arrived
#A negative is produced by inserting not after have/has:
=> You haven't arrived
#Question in present perfect are for mulated by starting a sentece with have/has:
=> Have you arrived?