Вчера мне не пришлось проверять тет

Вчера мне не пришлось проверять тетради своих студентов, так как мне пришлось заменять другого преподавателя.

Результаты (английский) 1:

Today I don't have to track their students ' notebooks, because I had to replace another teacher.

Результаты (английский) 2:

Yesterday I did not have to check their students notebook, because I had to replace another teacher.

Результаты (английский) 3:

Yesterday I did not have to check their notebooks students, as I had to replace another instructor.