Accept/Except
Accept – To receive something
Except – Means but or with exception to
Affect/Effect
Affect – Influence or Change
Effect – Result of something
And/Or
If you use this in you CV it will usually have three outcomes instead of two. For example: I will write my CV and/or a cover letter. This implies that you will either: write a CV, write a cover letter or write a CV and cover letter.
Assure/Ensure/Insure
Assure – To convince or guarantee something
Ensure – To make certain of something
Insure – To protect something against loss
It’s/Its
It’s – It is
Its – Possessive
Their/They’re/There
There – Where something is i.e. it is over there
They’re – They are (remember the apostrophe?) i.e. They’re (They are) over there
Their – Possessive i.e. Their coats are over there
Then/Than
Then – Something will happen
Than – Indicates a difference between something
To/Too/Two
To – Function word indicating an action or process
Too – Excessive amount of something, someone possesses the same item or doing the same thing e.g. I am too tired, he has those too!, you’re going too?
Two – A number
Weather/Whether
Weather – The current weather outside i.e. rain, sun, wind etc.
Whether – Express doubt or choice between alternatives i.e. I don’t know whether to go or stay
Your/You’re
Your – Possessive i.e. it is your go
You’re – You are i.e. You’re (You are) correct