Have they noticed us?

1. Have we been noticed by them?
2. Are we been noticed by them?
3. Could we have been noticed by them?
4. Are we being noticed by them?

Converting present perfect interrogative active to passive: original “Have they noticed us?” becomes “Have we been noticed by them?” Structure: auxiliary (have) + new subject (we) + been + past participle (noticed) + agent (by them). The passive question maintains present perfect tense and focuses on the recipients (us) rather than the observers (them). This transformation is common when emphasizing who received the attention.