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1. since

   • is wed for a apeafictime

2. for

   • is used for a general period of time

3. already

   • we use it in affirmative sentences it goes betmen the auxiliare verb and past participe

4. yet

   • we use it in interrogative and negative sentences,it goes at the end of the sentences

5. never

   • you can make the sentences negative if you add never, it goes btween the auxiliary verb in past participe

6. ever

   • mostly used in interrogative sentences it goes between the auxiliary verb and the past participe

7. still

   • it is used in negative sentences it goes before the negative form and the past participe

8. just

   • it is used in affirmative sentences between the auxiliary verb and the past participe verb