* is - This is the present tense form of the verb "to be", acting as a helping verb in this sentence.
* coming - This is the present participle of the verb "to come", acting as the main verb in this sentence.
* is - This is the present tense form of the verb "to be", acting as a helping verb in this sentence.
* coming - This is the present participle of the verb "to come", acting as the main verb in this sentence.