Basic Throw In Questions

[Official]

Just thought I'd post this new question here instead of making another thread.

On an inbounds play I understand a player can not jump from OOB into play while receiving a pass in the air.

Can the player have one foot in bounds and the other in the air while coming in bounds? Or does the player have to have established him/her self in bounds by both feet coming down.

One more: Can the in-bounder drop the ball, pick it up, and throw it in, assuming the ball doesn't roll in-bounds.

Hopefully you can make sense of this. Thanks.