Exclamations!
Most exclamations in English are preceded by what or how:

--What terrible weather!
--How awful!

What is used much more frequently than how in everyday language.

Exclamations can be as brief as one or two words (What a mess!) or as long as a sentence:

--What a way to end my vacation!

NOTE: Don't forget that what and how are most frequently used in questions:

-- What did you say?
-- How much does it cost?

Using Conjunctions
Here are some conjunctions that are frequently used in subordinate clauses:

When a conjunction is used with a subordinate clause, the construction is called an adverbial clause.
Here are some adverbial clauses that relate to time:
--After we leave the bank, we'll spend the money.
--When they arrived, they sat down to dinner.
--We haven't seen her since she left.
And here are clauses that show cause and effect relationships:
--Since you didn't call, I made other plans.
--He went to bed, because he was tired.
Another way to show a cause and effect relationship is to use such... that and so... that:
--It was such a nice evening that they stayed up too late.
--The lemonade was so cold that she couldn't drink it.