1. BECAUSE
1.1. is used to connect effect and cause
1.1.1. You were sad because of the breakup.
1.1.2. Because my boyfriend broke up with me
1.1.3. She studies a lot because she wants to pass the test.
2. AND
2.1. is a conjunction, word used to join other parts of speech
2.1.1. please, buy butter and milk
2.1.2. he woke up and took a shower
2.1.3. she has always bee nice and sweet
3. FOR
3.1. is used to express the duration of an action, the period of an action or an event.
3.1.1. I´ve lived here for 8 months
3.1.2. she was waiting for him for five years.
3.1.3. we haven´t seen each other for a long time.
4. SINCE
4.1. to specify from when it happens
4.1.1. I haven't seen Patrick since last week
4.1.2. She has won contest every year, since 2010
4.1.3. He has loved her since he met her
5. AS
5.1. "As" is used in comparative sentences of inferiority and equality
5.1.1. John can run as fast as Peter
5.1.2. My dad doesn’t have as much energy as he used to have
5.1.3. Nobody paints as Picasso did
6. IN FACT
6.1. used to place empasis on what is being said
6.1.1. He was in fact near death by the time they reached him.
6.1.2. a complete disaster, in fact. It rained all the time.
6.1.3. They said they had spent a year in China but in fact they were only there two weeks.
7. OBVIOUSLY
7.1. You use obviously when you are stating something that you expect the person who is listening to know already.
7.1.1. Obviously, they've had sponsorship from some big companies.
7.1.2. There are obviously exceptions to this.
7.1.3. They obviously appreciate you very much.
8. FINALLY
8.1. We use finally to refer to something that happened after a long time and usually after some difficulties.
8.1.1. There were no taxis and we finally got home at 2 pm.
8.1.2. She’s had over twenty interviews but Jasmine has finally got a job as a journalist.
8.1.3. You finally had your hair cut.
9. AT LAST
9.1. At last is used to say that something happens after waiting or trying for a long time, and when you're happy about it.
9.1.1. It's nice to be back home at last.
9.1.2. At last, we arrived!
9.1.3. At last you understand what I'm trying to say!
10. THEN
10.1. This word is used when we need to place actions in time
10.1.1. If you don’t wear sunscreen, then you run the risk of burning.
10.1.2. I wake up, then I brush my teeth.
10.1.3. yes, but then you have to be here every day.
11. THAN
11.1. the word than is used in comparison phrases
11.1.1. he is older than my brother.
11.1.2. there are more than ten people in the room.
11.1.3. And our family is more than the seven of us.
12. IN ADDITION
12.1. this connector is used with nouns and its use is quite simple.
12.1.1. The sentence includes a fine in addition to prison time.
12.1.2. Dixon had many talents in addition to his mathematical ones.
12.1.3. That´s in addition to the little stipend under the table.
13. DEFINITELY
13.1. You use definitely to emphasize that something is the case, or to emphasize the strength of your intention or opinion.
13.1.1. He definitely left the house this morning.
13.1.2. He is definitely running late.
13.1.3. The blood on the screwdriver definitely belong to your victim.
14. ACTUALLY
14.1. It is generally used to emphasize the truth of something we are saying.
14.1.1. I actually don't have a bad family.
14.1.2. Actually my name is Martin.
14.1.3. Actually, it was only a rumor
15. EVENTUALLY
15.1. We use the adverb eventually to mean ‘in the end’, especially when something has involved a long time, or a lot of effort or problems:
15.1.1. My family couldn't find me, and eventually they gave up.
15.1.2. But he's going to have his way with us, eventually.
15.1.3. Well, eventually that's what happens when you grow up.
16. AT THE END
16.1. You use at the end when everything else has already been taken into consideration and you want to emphasize what is most important. Most of the time it is followed by.
16.1.1. At the end of the day you will have to decide where you want to live.
16.1.2. At the end of 2003.
16.1.3. At the end of the concert