কোনটি শুদ্ধ বাক্য?

অশুদ্ধ

শুদ্ধ

He is my elder brother.

He is my elder brother.

He went for the examination

He sat for the examination.

It is raining for three days

It has been raining for three days.

He was bitten by the snake while walking in the garden.

He was bitten by the snake while he was walking in the garden.