Question

Complete the statement using -
just/already/yet+verb(have) in its appropriate form:
She says: ‘Would you like something to eat?’
You say: No, thank you. ______________.
A. I have already had lunch.
B. I have just had lunch.
C. I have had lunch yet.
D. I has just had lunch.

Answer 1

Hint: “just” is used as an adjective as well an adverb. When used as an adjective, it means factually right, correct, or factual, for example, it is just an assessment of the facts. When used as an adverb, it means only, simply, merely. For example, he calls it blue, but it’s just red to me. The word “already” means prior to something. It is an adverb. For example, are you quitting from your job already? The word ‘yet’ is also an adverb usually related with negative meaning, thus far, up to the present, up to some specified time. For example, have you completed yet?

Complete step by step answer:
Let’s discuss the given options and find the correct answer.

I have already had lunch: The sentence, “I have already had lunch” perfectly fits the given sentence, as the words given in the question are perfectly used. The sentence has no grammatical mistakes.
I have just had lunch: The sentence, “I have just had lunch” too perfectly fits the given sentence, as the words given in the question are perfectly used. The sentence has no grammatical mistakes.
I have had lunch yet:The sentence, “I have had lunch yet” does not perfectly fit the given sentence, as the words given in the question are perfectly not used. The sentence has grammatical mistakes.
I has just had lunch: The sentence, has grammatical mistakes, has is not used with I.

Hence, the optionA and B:I have already had lunch and I have just had lunch, is the correct answer

Note:
Adverb is a word which qualifies a verb that is an adverb is a word by which a verb is being modified. By adding –ly to the end of the adjective, most adverbs are being formed.