Ingles

PREPOSITIONS IN EXPRESSIONS OF TIME
Preposition | Use | Examples |
in | in months | in July; in September |
| Year | in 1985; in 1999 |
| Seasons | in summer; in the summer of 69 |
|part of the day | in the morning; in the afternoon; in the evening |
| Duration | in a minute; in two weeks |
at | part of the day | at night |
| time of day | at 6 o'clock; at midnight |
|celebrations | at Christmas; at Easter |
| fixed phrases | at the end of the week
at the same time |
on | days of the week | on Sunday; on Friday |
| Date | on the 25th of December* |
|special holidays | on Good Friday; on Easter Sunday; on my birthday |
| a special part of a day | on the morning of September the 11th* |
after | later than sth. | after school |
ago | how far sth.happened (in the past) | 6 years ago |
before | earlier than sth. | before Christmas |
between | time that separates two points | between Monday and Friday |
by | not later than a special time| by Thursday |
during | through the whole of a period of time | during the holidays |
for | period of time | for three weeks |
from ... to
from... till/until | two points form a period | fromMonday to Wednesday
from Monday till Wednesday
from Monday until Wednesday |
past | time of the day | 23 minutes past 6 (6:23) |
since | point of time | since Monday |
till/until | no laterthan a special time | till tomorrow
until tomorrow |
to | time of the day | 23 minutes to 6 (5:37) |
up to | not more than a special time | up to 6 hours a day |
within | during a period of time| within a day |
* The words in italic are only spoken, not written (date).

USE OF THIS, THAT, THESE AND THOSE
This and these:
This and these for objects that are close at hand. This is used forsingular objects, and these is used for plural objects.
Examples:
This is your desk
These are my books

That and Those:
That is used for singular objects, and those are used for plural...