I have four questions to ask:
Please read the sentence:
You've changed lot.
I know I can say 'a lot' and 'lots of'. But I don't know why 'lot' here. Is it a mistake? Yes it is a mistake. The only correct answer from your choices is "a lot"
You've changed a lot.
He was full of pride at his success.
I can't find any example of 'pride at'. Is 'at' a mistake? No, it is correct.
"at his success" is an adjective prepositional phrase modifying "pride"
The man, hidden in his overcoat, listened carefully.
Is the use of 'hidden' from the phrase 'to hide oneself in' so that we should use the passive voice 'hidden' here?
"Hidden" is not passive voice. It is the past participle of the verb "hide". "hidden in his overcoat" is an adjectival phrase modifying the noun "man".
She gazed upon his face.
I know there is a phrase 'to gaze at'. Do the two phrases bear the same meaning? When you use "gaze upon" you mean you look at something in an thoughtful approving manner...you like what you see. To "gaze at" just means to "stare at" something in a thoughtful manner.
Looking forward to hearing from you.
Thank you in advance.
Have a nice weekend.
Student or Learner