1. They go to the library every day. 2. He works at the English laboratory every day. 3. We got excellent marks at the exams. 4. She liked to work in the evening. 5. We shall translate this text in class. 6. They will finish this experiment in some days.

They go to the library every day.
This sentence is in the present simple tense, which is used to describe habits, routines, or things that happen regularly. "They go" indicates a repeated action, and "every day" emphasizes the frequency of this action.

He works at the English laboratory every day.
This is also in the present simple tense, with "works" being the verb in the third person singular form. The sentence indicates a habitual action, with the frequency of "every day" highlighting the regularity of the action.

We got excellent marks at the exams.
This sentence is in the past simple tense, used for actions that happened and were completed in the past. "Got" is the past form of the verb "get," and "excellent marks" refers to the results received at the exams.

She liked to work in the evening.
This sentence is in the past simple tense as well. "Liked" is the past form of "like," indicating that in the past, she had a preference for working in the evening. The action is no longer happening in the present, but it was a habit or preference at a specific point in time.

We shall translate this text in class.
This sentence uses the future simple tense, with "shall" indicating a future action. The verb "translate" shows what will happen in the future, and "in class" indicates the place where the translation will occur.

They will finish this experiment in some days.
This is in the future simple tense, with "will finish" showing that the action of finishing the experiment will occur at a future time. "In some days" refers to the expected timeframe for completing the experiment.