The <em>Progressive Form of verbs</em> is formed with verb BE + ing (present participle). The progressive tenses give the idea that an action is in progress, the action is continuing. Examples:
1) She<em> is sleeping</em> right now.
2) They <em>were working</em> yesterday.
3) My friends will be playing volleyball tomorrow.
The <em>Perfect Progressive Tenses</em> are formed with have + been + ing.
Present Perfect: I have finished my dinner already. Past Perfect: He had watched television for an hour before practice. Future Perfect : Robert will have finished by the time his parents return.