We generally use just, still, yet, & already with present perfect tenses.
When Just is used with Present Perfect Tense, it stands for “a short time before.” It is placed between the has/have and the past participle.
I have just seen him.
When yet is used with Present Perfect Tense, it stands for “at any time up to now.” It emphasizes that you want something to be done soon. The word “Yet” is suitable with negative sentences. It is used at the end of a sentence.
I haven’t seen him yet.
The word “still” in present perfect tense and is used in between the subject and the verb (has/have). It is used in negative sentences and emphasizes on expecting something to happen earlier.
I still haven’t seen him.
“Already” stands for “before now”, emphasizing on something that happened earlier than expected. It comes between has/have and the past participle. For clause, it uses at the end.
I have already seen him.
Fill in the blanks with suitable “Just, Still, Yet, & Already”.