By “killers” I mean phrases that kill your writing.
NEVER start your story with “One bright, sunny day”, because about half your class will have started in the same way and your teacher will think, “Oh no! Not another one!” Instead of “One bright, sunny day I went to the park with my friend Ali.” try, “Last Saturday was so sunny it was too hot for football, so Ali and I sat in the shade of the tallest tree in the park and chatted.”
NEVER start your story with “One dark and gloomy night”, because the other half of your class will have done that. Instead, how about, “Not even a glimmer of moonlight broke through the clouds”.
It doesn’t matter how exciting your story has been – if you end it with, “It was all a dream!” your teacher will be bored. After a couple of pages of being chased by vampires, instead of writing:
“Wake up! It’s time for breakfast,” said mom. Thank goodness – it had all been a dream.
“Wake up! It’s time for breakfast,” said mom, smiling to reveal blood-stained fangs.
Dare to be different and your writing will benefit.