Yes, it is the present participle of the verb 'rain'
The present tense of rain is:I/You/We/They rain.He/She/It rains.The present participle is raining.
no, raining is a transitive verb indicating large quantities of something is falling or intransitive verb indicating rain is falling.
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 shaking.
The present participle is coming.