Time prepositions

| Unit                       | Preposition | Example                                                                                                                  |
|----------------------------|-------------|--------------------------------------------------------------------------------------------------------------------------|
| second                     | -           | Come here right this second!                                                                                             |
| minute                     | -           | Come here right this minute!                                                                                             |
| hour                       | at          | At 11, we will serve lunch.                                                                                              |
| day                        | on          | The teacher will collect our homework on Wednesday. I arrive on the 24th.                                                |
| week                       | -           | This week I'm going skiing in Colorado.                                                                                  |
| month                      | in          | In August last year, I attended a summer conference in California.                                                       |
| year                       | (in)        | (In) The following year, I took a trip to a musical festival in New York City where I met a bunch of like-minded people. |
| decade, century, millenium | in          | In the 41st millenium, there is only war.                                                                                |