Vasilyuk O.M. "The tense and aspect forms of the verbs ". Perfect form group. Active voice. Part ІІI. For 9-th year pupils (According to Alla Nesvit's course program).

• to talk about an action which started in the past and continues up to the present; to talk about a past action with a visible result in the present; to refer to an experience; for an action which happened at an unstated time in the past, the action is more important than the time; situations and actions in a time up to present; past actions with the results in the present.t

- to say which past action happened first or what time in the past the action had finished up; We often do not use the Past Perfect Tense, if it is already clear, which action happened first

-to express an action that will occur before a certain point or another action in the future and end before it

• Already / yet, just, never/ always, ever, lately / recently, this morning / evening, week, month, year, today, lately / of late

• Before, by, before she came home, by o’clock yesterday, by the morning, by evening, by Monday

• Before, by, before/ when I come home, by  o’clock tomorrow, by the morning, by evening, by Monday, by then, by that time

• to talk about an action which started in the past and continues up to the present; to talk about a past action with a visible result in the present; to refer to an experience; for an action which happened at an unstated time in the past, the action is more important than the time; situations and actions in a time up to present; past actions with the results in the present

• to say which past action happened first or what time in the past the action had finished up; We often do not use the Past Perfect Tense, if it is already clear, which action happened first

• to express an action that will occur before a certain point or another action in the future and end before it