headache

That's why:
you didn't sleep well yesterday,that's why you have headache today.

That's because:

A: My head feel pain today.
B: Why? Did you sleep late yesterday?
A: I did. I studied till 3am yesterday.
B: That's because you have headache.

Because:

You have headache because you didn't sleep well yesterday.

Write an essay on the causes of the Headache should be written by yourself.This short piece of writing on this subject to be gaining marks is a complete disaster, esp. on how to use --"that's why"---"that's because"---"because"---?
Keep a clear head in a difficult subject especially one in which you have 3 phrases to deal with .
that's why:-------getting the bank to lend money because I'm broke and try run a new Buz;then I drank red-wine gives me to meet a loan shark by escaping but I fell head first down the Bank's staircase !

that's because:---a person was fired today by Co. clerk who calculated wrong causing the lost and close of the Co. Suddenly it causes worry and trouble by seeing the wife and daughter run away at the same time.

because:-----I had a very severe splitting headache , then suddenly a car banging my head against its steel front accidentally. Can you forcast where my head is heading to my headache? Shall I died to an end ?

2015-04-18 23:01:10 補充：
because:--Consult a Doctor,(because) he has the Pill to cure your headache.