She is writing a letter. 

= A letter is being written by her.

She said that she had done the work the previous day.

She said to him "I shall call you as soon as possible". = She told to him that She should call him as as possible.

The reported speech for the sentence "She said to me, 'Did you fake the examination?'" can be changed to:

She asked me if I had faked the examination.

She takes pride on her beauty.

she takes after her mother

She talks as if  she knew everything

She was exempted __to__ the fine.

Shihab is the tallest boy in the class   = Shihab is taller than any other boy in the class.

Shut the door. = Let the door be shut.

Silver lining=When things look black, there's always a silver lining.
The agency managed to find a silver lining in the flames.

Smile on (মৃদু হাসি দেওয়া) He had a huge smile on his face.

Smoke filled the room. (Passive) = The room was filled with smoke.

Smoke is emitted from the chimney.

Someone will walk her dog. (Passive) 

= Her dog will be walked.