Verb tenses/ verb form: Put the verbs in the correct tenses

* Verb tenses/ verb form: Put the verbs in the correct tenses. (0.4 pts)
Question 47: The children (not/ finish)………………………...the assignment yet.
Question 48: He usually (write) __________ in green ink.
Question 49: Robot helps us (do)………..difficult or dangerous task
Question 50: The students stop(talk) …………………when the teacher came in