His sister waved around the tree.
This is a careless construction, which is grammatically correct and is not an idiom or a jargon.
Hi,
In the first sentence, the subject is ‘you’.
In the second one it is ‘I’.
In the third one it is ‘You’.
To find the subject in a sentence you should look at the verb and find the person/people/thing that make the action the verb describes.
Hope this helps! If my answer was not clear enough or you’d like further explanation please let me know.
Its at a house where someone plants flowers and enjoys her home in her garden.
