Surely or Surly?
Exemple : ‘’Surely it will be worth it in the end!’’
The word "surely" and "surly" are often mixed up as they are spelt very similarly. The word "surely" is used as an adverb to express certainty or near certainty.
Exemple : ‘’The shop assistant gave me a very surly look.’’
The word "surly" is used as an adverb to express that someone is unfriendly or impolite.