#3
Top photo definitely male
Episyrphus balteatus - the most commonly recorded hoverfly in the UK, and I suspect many other places as well.
The bottom two are male
Sphaerophoria scripta - at least
S scripta is the only
Sphaerophoria in the UK in which the abdomen of the male is significantly longer than its wings, making it easy to ID. Not sure if it is unique in this elsewhere, but I think so.