$1.$ wanted/ were not

- want + to V

- S + was/ were

$2.$ is going

- S + tobe + V-ing.

$3.$ will probably assign

- S + will + V.

$4.$ will have finished

$5.$ have not been driving

$6.$ have been waiting

$7.$ was/ had been waiting

$8.$ hear/ had been working/ had worked

$9.$ will carry

$10.$ had seen

$11.$ has climbed/ sailed/ gone

$12.$ is raining

$13.$ had climbed/ sailed/ had experienced

$14.$ Did they spend

$15.$ were/ had been crying

$16.$ will have driven

$17.$ will be singing

- S + will + be + V-ing.

$18.$ woke up/ had already prepared

$19.$ will have been studying

$20.$ Have you ever seen

- Have/ Has + S + V3?