The park is over their, they're, there, and you can find the picnic basket their, they're, there, too.
there, there
You're/your going to have to remember that you're/your a great friend.
you're, you're
The heavy rain will affect/effect the farmer's crops, but the affect/effect might not be noticeable for weeks.
affect, effect
The principle/principal ingredients for a cake are flour, sugar, and eggs.
principal
If you finish your chores, then/than you can play.
then
Don't take to,too, two long as there are to, too,two other people who want to, too, two use the internet.
too, two, to
It's/its been a long time since I've seen you.
it's
She always follows her grandmother's financial advise/advice.
advice
The town council/counsel voted to council/counsel the new employees on company policy.
council, counsel
The governor wants to raise capital/capitol for a new project on the state capital/capitol building.
capital, capitol
The student will site, cite, sight sources from the library's site, cite, sight to prove their research
cite, site
I need to know whose/who's dog is barking.
whose
I will accept/except all the cookies, accept/except for the oatmeal chip ones.
accept, except
The dog lies/lays on its bed, reclining upside down.
lies
The weather/whether is bad, so I don't know weather/whether to go to the game.
weather, whether
Their, there, they're excited to see their, there, they're new house!
The company updated its/it's website, and now its/it's faster and easier to navigate.
its, it's
The company really wanted her to accept/except their job offer.
accept
The scientific principle/principal of gravity was discovered by Isaac Newton.
principle
I often like planning a vacation more than/then I like the vacation itself.
than
The game was almost to,too,two exciting in the last to, too, two minutes of play
too, two
Who’s/Whose eaten at this restaurant before?
Who's
Mary adviced/advised me to stop taking the medicine, as it does more harm than good.
advised
The defendant needs to seek legal council/counsel before the trial begins
counsel
Mrs. Van Buren used her monogrammed stationary/stationery to decline the invitation for tea.
stationery