Page 1000 - Wordsmith A Guide to College Writing

Then is used to show time or cause and effect;
than is used to compare.

Call me tomorrow; by then I will have an answer.

If the American history course is closed, then Kristina will enroll

in a world history course.

Fat takes up more space than muscle because it is less dense.

there, their, they’re

There is used to mean in that place or to start
a sentence or clause. Their means belonging

to them, and they’re means they are.

“They’re here already!” Kim yelled as her aunt and uncle pulled

into the driveway.