Question

They are watering the plant what tense is this and tell the subject,verb and object​

Answer 1

Answer:

present continuous tense

Answer 2

Answer:

The present perfect tense can be used to talk about finished events. The present perfect continuous tense cannot be used to talk about finished events. Compare: I have watered the plants.

so, here present continuous tense is used

Explanation:

Hope it helps you