Open the brackets:
1)I already (to write) the letter.
2)I (to write) the letter yesterday.
3)Next week they (to see) the film.
4)She (to swim) well.
5)The teacher (to check) the students' works every evening.
6)Last week Mary (to visit) her granny.
7)We (to be) good student.
8)Now we (to write) a test.
9)Every month we (to do) a new experiment.
10)At the moment students (to listen to) the teacher.