Progressive forms of verbs

The progressive forms are used to show that an action is continuing or progressing at the time indicated by a particular tense.

I am studying English. (the action is continuing)

The progressive form of a verb is made up by using some form of the verb to be with the ing form of the principal verb. The form of verb that ends in ing is called the present participle.
The following are the progressive forms of the verb call for the 6 tenses (first person, singular)

I am waiting for you. (present progressive)
I was waiting for you. (past progressive)
I shall be waiting for you. (future progressive)
I have been waiting for you. (present perfect progressive)
I had been waiting for you. (past perfect progressive)
I shall have been waiting for you. (future perfect progressive)