can have and have been be used together to maintain parallelism.
eg : 1) My classmates have visited the monument or have been to the city.
2)They have a drug prescription with a dosage too low to be effective, or have been taken off a drug too soon
Have is present perfect tense while have been is present perfect continuous tense.
eg : 1) My classmates have visited the monument or have been to the city.
2)They have a drug prescription with a dosage too low to be effective, or have been taken off a drug too soon
Have is present perfect tense while have been is present perfect continuous tense.












