The document discusses different words used to introduce reasons such as "because", "as", "since", "for", "therefore", and "so". It provides examples of how each word can be used to give a reason for something when speaking or writing in both formal and informal contexts. Different words introduce new reasons to the listener or assume the listener is already familiar with the context.

1. Giving Reasons

2. Because
When something is important for us and we want to
give a reason for it, we use because.
•Because they did not pay me back, had to borrow
money from the bank.
•Because my alarm-clock did not go off, I nearly
missed my flight.
•Why are you crying? I’m crying because I lost my
mother’s pearl earrings.

3. As and Since
When we use as and since to give reason it means
that the listener is already familiar with the reason.
•As we arrived late, we had to wait for the next train.
•Since I was thirsty, I had to drink some water first.

4. For
Same as because, for also introduces a new reason
to the listener. For-clauses cannot be used in the
beginning of the sentence.
•I had to stay home and nurse my sick child– for she
was too sick to go to school.

5. Therefore and So
• Therefore can be used to give reasons instead
of so in formal English. It can come at the
beginning of the clause or after the first word or
phrase; or before the main verb:
• This hotel is too expensive for us; therefore, we
will need to find another one.
• I was having very bad results, so I transferred to
another school.

6. Therefore and So
• Therefore can be used to give reasons instead
of so in formal English. It can come at the
beginning of the clause or after the first word or
phrase; or before the main verb:
• This hotel is too expensive for us; therefore, we
will need to find another one.
• I was having very bad results, so I transferred to
another school.