Раскройте скобки, употребляя глаголы в present perfect. 1. i don't know this girl. i never (to meet) her before. 2. where is mother? - she just (to go) out. 3. don't you know what the film is about? - no, i (not/to see) it. 4. don't worry about the letter. i already (to post) it. 5. is he a good teacher? - oh, yes. he (to help) me a lot. 6. he knows london perfectly well. he (to be) there several times. 7. i cannot find my umbrella. i think someone (to take) it by mistake. 8. do you speak spanish? - no. i never (to study) it. 9. do you know, where they have gone? - no. they (to sell) their house and (not/leave) their new address.

Ниже представлены предложения с раскрытыми скобками. Глаголы употреблены в форме Present Perfect, которая образуется при помощи вспомогательного глагола have/has и третьей формы глагола (V3).

1. I don't know this girl. I have never met her before.
2. "Where is mother?" — "She has just gone out."
3. "Don't you know what the film is about?" — "No, I have not seen it."
4. "Don't worry about the letter. I have already posted it."
5. "Is he a good teacher?" — "Oh, yes. He has helped me a lot."
6. He knows London perfectly well. He has been there several times.
7. I cannot find my umbrella. I think someone has taken it by mistake.
8. "Do you speak Spanish?" — "No. I have never studied it."
9. "Do you know where they have gone?" — "No. They have sold their house and have not left their new address."

Краткая справка по грамматике Для правильного построения предложений использовались следующие правила:

• Утверждение: I / You / We / They + have + V3; He / She / It + has + V3.
• Отрицание: Добавляется частица not после вспомогательного глагола (have not / has not).
• V3 (Третья форма): Для правильных глаголов добавляется окончание -ed (posted, studied, helped), для неправильных используется форма из третьего столбца таблицы (met, gone, seen, been, taken, sold, left).

Я могу составить для вас аналогичное упражнение для закрепления материала или проверить другие ваши задания.