Answer:
1. are working
past participle
2. was going
past progressive
3. will be singing
future progressive
4. have created
present perfect
5. had turned
past perfect
6. will have studied
future perfect
7. abandoned building
participial phrase
Explanation:
These are all different tenses that show the time action was taken.
Some of them are about future events that are yet to occur, some are future events that are continuous or progressive, some are past events, some are past progressive events, some are present tenses, some are present tenses, some are past perfect tenses.
