Question

Ten new members have enrolled and seven ......................
a.) have resigned
b.) have been resigned

Answer 1

Ten new members have enrolled and seven have resigned .

Answer 2

Ten new members have enrolled and seven have resigned

Explanation:

When to use "Have"?

When the action has been "completed in the past"

Used when the sentence is in present perfect tense

Here the verb will be in past tense.

See the verb which ends with "ed". (Enrolled)

When to use "Have been"?

To be used in the "present perfect continuous tense"

The action would have "began in the past" and if still the action continues then use "Have been".

Usually the verb would be followed have "ing" form

Example:"running”, “walking”, “doing”