"has" as an auxiliary, it helps complete a sentence of present perfect tense with the following verb togegher .the verb here is "past participle"
eg: she has been to china.
He has finished his paper.
if there is "has not " it means negative meaning of a sentence of present perfect tense.
eg:she has not been to china.
H e has not finished his paper.
so "has not' should be followed by "past participle".
The present tense of the verb 'was' is is.
Can is the present tense.
The present tense for the verb "have" is "have" for the pronouns I, you, we, and they, and "has" for the pronouns he, she, and it.
"Is" is the present tense form of the verb "to be" and "has" is the present tense form of the verb "to have."
Studied is not a present tense verb. It is the past tense of study (present tense).
Washes is the present tense.
Present tense.
* I am * you/we/they are * he/she/it is
The present tense is 'is'
But is not a verb and does not have a present tense.
Be is present tense, Being is present progressing tense, and been is past tense
The verb is is the present tense.