1. they can be about
1.1. Places
1.1.1. where, wherever
1.1.1.1. We’ll go to the bar where they asked us to wait.
1.2. Time
1.2.1. when, whenever, while, as, before, after, once, prior to, since
1.2.1.1. There may come a time when I would do this, though I can’t imagine when that would be.
1.3. Manners
1.3.1. as, as though, as if
1.3.1.1. Frank ran the race as though his life depended on it.
1.4. Cause or Reason
1.4.1. because, since, as, in view of, on account of, seeing that
1.4.1.1. Because he loved her, he didn’t believe she had an affair.
1.5. Purpose
1.5.1. in order that, so that, with the object to
1.5.1.1. So that she would have a tan for her vacation, she went to a tanning salon.
1.6. Result
1.6.1. so that, so……that, such that, such…..that
1.6.1.1. She took a break, so that she can work harder.
1.7. Contrast
1.7.1. although, though, even though, even if, while, whereas
1.7.1.1. Although she has a business degree, she is working as a retail clerk.
2. "ING" Form
2.1. it has multiple forms like
2.1.1. continuous times
2.1.1.1. to be + -ing
2.1.1.1.1. We are playing soccer, to kill time.
2.1.2. preposition of the object
2.1.2.1. preposition + -ing
2.1.2.1.1. This should be banned for the high damage that cause in the health, and in the recovering of the patient.
2.1.3. sustantive
2.1.3.1. –ing as sustantive
2.1.3.1.1. This has various uses for the threatment of the disease, curing the patient.
2.1.4. adjective
2.1.4.1. –ing + sustantive
2.1.4.1.1. We have not found any clue about this strange disease.
2.1.5. contracted adverbial clause (active)
2.1.5.1. Before/After - When/While + ing
2.1.5.1.1. After the game, we were eating. Before the game, we were eating. When the game started, we stop eating. While we were watching the game, we were eating.
2.1.6. contracted adjective clause (active)
2.1.6.1. sustantive +ing
2.1.6.1.1. We can see a huge crater made from the meteorite, this cause a huge chaos in the area surrounding
2.1.7. "ING" after certain verbs
2.1.7.1. verb + ing
2.1.7.1.1. I start eating pie when I was 8.