The present participle is paying.
Paid is the past participle; paying is the present participle.
I/you/we/they pay. He/she/it pays. The present participle is paying.
Being is the present participle. The past participle is been.
Getting is the present participle of get.
The present participle is doing.
Presenting is the present participle of present.
Presenting is the present participle of present.
The present participle is choosing.
The present participle is walking.
The present participle is cleaning.
The present participle is seeking.
The present participle of "understand" is "understanding."