For me common spelling mistakes include confusing some of these word pairs.
- loose vs. lose
- then vs. than
- were vs. where
 5·1 month ago 5·1 month ago- “When?” > “Then!”
- Rather than the alternative
 
- Cause and effect
- When deciding which to use for a verb:
- Effect causes an entire result; “A discarded cigarette effected the forest fire”
- Affect alters part of the result; “Human behaviors affect climate change.”
 
 
- When deciding which to use for a verb:
 
- “When?” > “Then!”
