3. Warm up:
What is called grammar?
What is called parts of speech?
How many parts of speech in English language?
What are they?
4. PREPOSITION
It is a word or group of words used before a
noun, pronoun, or noun phrase to show
direction, time, place, location or to introduce an
object.
The most common prepositions are at, by, for,
from, in, of, on, to, and with.
Other common prepositions are about, among,
across, after, below, because of, under, up,
within, without, etc.