probably not, there isn't any proof that there has been abductions anywhere, but it isn't impossible
Some people claim to have been brought aboard alien craft and met with humanoid beings. It is up to each individual to decide for themselves whether to believe or not.
No.
yes
NO!
There is no evidence that abduction by extra-terrestrials has occurred on Earth. However, there have been numerous reported alien abduction cases that have been purported by previously trusted individuals such as police and military personnel. There have been several abduction cases with multiple witnesses as well.
No.
Yes indeed they have.
yes
Apparently, there have been strange sightings, but there has been no evidence or proof that an extraterrestrial being (alien) has actually been seen.
yes
So far, there has been NO CONFIRMED FINDING of any alien life - caught or otherwise.
No. Nor even a far one