We have planted a very big tree recently? задавать и докончить на все вопросы.
1) How we planted a very big tree recently?
2) Who was planted a very big tree recently?
3)....

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Have we planted a very big tree recently? Общий Have we planted a very big tree or a big bush recently? Альтернативный What have we planted recently? Специальный When have we planted a very big tree? СпециальныйWho has planted a very big tree recently? Вопрос к подлежащему We have planted a very big tree recently,haven’t we? Разделительный