Question : Identify the segment in the sentence which contains the grammatical error. If there is no error, select 'No error'

The letter was posting yesterday by my brother.

Option 1: No error

Option 2: The letter

Option 3: was posting yesterday

Option 4: by my brother

Question : Identify the segment in the sentence which contains a grammatical error. If there is no error, then select the option 'No error'.
Sh! Someone listens to our conversation.

Option 1: listens to

Option 2: No error

Option 3: Sh! Someone

Option 4: our conversation

Question : Identify the segment in the sentence which contains a grammatical error. If there is no error, then select the option 'No error'.
I am hearing a strange noise now

Option 1: a strange

Option 2: No error

Option 3: I am hearing

Option 4: noise now

Question : Identify the segment in the sentence which contains the grammatical error. If there is no error, select 'No error'.
Anita enjoyed to swim in the sea.

Option 1: Anita enjoyed

Option 2: in the sea

Option 3: No error

Option 4: to swim

Question : Identify the segment in the sentence which contains the grammatical error. If there is no error, select 'No error'
We watched the workmen to repair the tiles of the kitchen.

Option 1: We watched the workmen

Option 2: No error

Option 3: of the kitchen

Option 4: to repair the tiles