Choose the correct form: present perfect or present perfect continuous. 1) i have practised have been practising these tenses for three weeks. now i understand them better. 2) our company has been doubling has doubled its turnover over the past six months. 3) i have stared have been staring at this menu for ages now and i still haven`t decided yet. 4) i have often told have often been telling her to be extra careful when opening the car door. i'm not really surprised to hear that she hit a pedestrian. 5) i have done have been doing paperwork all day. in all, i guess i have signed about 65 letters.

Добрый вечер!

1) I have been practising these tenses for three weeks. Now I understand them better.

2) Our company has doubled its turnover over the past six months.

3) I have been staring at this menu for ages now and I still haven`t decided yet.

4) I have often told  her to be extra careful when opening the car door. I'm not really surprised to hear that she hit a pedestrian.

5) I have been doing paperwork all day. In all, I guess I have signed about 65 letters.

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1) The correct form is present perfect continuous: "I have been practising these tenses for three weeks. Now I understand them better." This tense is used to talk about actions that started in the past and are still continuing in the present.

2) The correct form is present perfect: "Our company has doubled its turnover over the past six months." This tense is used to talk about actions that started in the past and have a result in the present.

3) The correct form is present perfect continuous: "I have been staring at this menu for ages now and I still haven't decided yet." This tense is used to talk about an action that started in the past, is still continuing in the present, and may continue into the future.

4) Both forms are possible, but present perfect continuous is more suitable: "I have often been telling her to be extra careful when opening the car door. I'm not really surprised to hear that she hit a pedestrian." This tense is used to talk about actions that started in the past, are still continuing in the present, and may continue into the future.

5) The correct form is present perfect: "I have done paperwork all day. In all, I guess I have signed about 65 letters." This tense is used to talk about actions that happened at an unspecified time in the past and have a result in the present.

Remember that the choice between present perfect and present perfect continuous depends on the specific context and the duration of the action. Present perfect is used when the action is completed or focuses on the result, while present perfect continuous emphasizes the ongoing nature of the action.