Respuesta :
Answer:
The correct answers are:
1. Have not phoned / have been really busy.
2. Have been.
3. Has not been.
4. She has known.
5. I have read.
Explanation:
The present perfect verb tense is used for the following things:
- An action or situation started in the past and continues in the present.
- An action performed for a period of time not yet completed.
- An action repeated in a non-specific period of time located between the past and the present.
- An action that has been completed in the very recent past, indicated by 'just'.
- An action for which the precise moment in which it occurred is not important.
This verb tense is formed by the auxiliary verb "to have" and a verb conjugated in past participle. If the verb is regular, "ed" will usually be added at the end. Whereas if the verb is irregular, you must learn each of the verbs so as not to make mistakes.
In this way, this verb tense is formed as follows:
I have + past participle
He
She has + past participle
It
We
They have + past participle
You