Answer:
12. Is being
13. Is studying
14. Will join
15. Released
Explanation:
Present tense
The present tense is a grammatical tense whose principal function is to locate a situation or event in the present time. The present tense is used for actions which are happening now.
Past tense
The past tense is a grammatical tense whose function is to place an action or situation in the past. Examples of verbs in the past tense include the English verbs sang, went and washed. Most languages have a past tense, with some having several types in order to indicate how far back the action took place.
Future tense
In grammar, a future tense is a verb form that generally marks the event described by the verb as not having happened yet, but expected to happen in the future. An example of a future tense form is the French aimera, meaning "will love", derived from the verb aimer.