We often use ever, never, just, already, and yet with the present perfect tense.
We use ever in interrogative sentences:
a. Have you ever been to the United States?
b. Have you ever traveled by train?
c. Have you ever failed a class?
We use never in affirmative sentences: but the meaning is negative.
a. I have never cheated in an exam.
b. My son has never been to Moscow.
c. My brother have never gone to London.
We use just to express a recently completed action.
a. The cat has just caught a bird.
b. The guests have just arrived.
c. I have just finished my homework.
We use already to express that something has happened sooner than expected.
a. Don't forget to bring your book! Oh, I have already brought it.
b. The boys are going to pack, aren't they? No. They have already packed.
c. Is Adam going to buy a new car? No, he isn't. He has already bought it.
We use yet in interrogative and negative sentences and it suggests a time later than expected.
a. Have you done your homework? No, I haven't done it yet
b. Has your father seen your report? No, he hasn't seen it yet
c. Have the visitors arrived? No, they haven't arrived yet.
Exercise
Fill in the blanks using ever, never, just, already and yet.
1. Have you ----------been in America? EVER
2. Do you hear the noise? The train has -----------arrived.JUST
3. No. Your cousin hasn't come to the party------------- .YET
4. Can you open the door? Oh, it is -------------------open.ALREADY
5. Your daughter has--------------------- returned home. You don't have to worry anymore.JUST
6. Haven't you finished your food------------------- ? No, I am still eating mom.YET
7. I am a very lucky person. I have ----------------------had nightmares.NEVER
8. Are you going to meet me at the shop? Yes, I am -------------------------there.ALREADY
9. I have------------------------- realized how beautiful you are.JUST
10. Would you like to have dinner with us? No thanks, I have ----------------
had dinner.ALREADY
11. Have you--------------------- seen such a big ant?EVER
