Prepositions normally precede noun or pronoun. There are three types of prepositions.
a) Preposition of place or position: in, at, below, above, on, between, behind, in front of, opposite etc.
b) Preposition of time and date: in, on, at, since, for, by, by, from, before.
c) Preposition of Travel and movement: from, at, to, up, down, across, along etc.

Above = higher than in position/higher than in status.
Across = on the other side from here/from onside to the other.
After = later than/ at the end of specified period.
Along = together with/ in company of/ from one end to the other end of thelength.
Among = surrounded by sb/sth.
At = exact time/ exact place/ with the sense of engaged in.
Before = earlier than/ in front of/ immediately preceding.
Behind = At the back of/ later than.
Below = lower than in position/ status.
Between = position in two things/ person/ place.
By = agent/ for means of transport (car/ bus/ air/ train)/ near to/ at the side of/ for dimension/ to denote amounts, quantities, numbers selling or buying….
For = purpose/ in favour of/ period of time/ length of time, representation.
In = position or entry to/ encloser within a particular place; area, or object/ external physical environment/ location/ idea of holding/ in the form of/ A period of time (in 2005)/ wearing something (in sari)
Into = combination of ‘in’ and ‘to’ (in motion)/ change from one form or state to another.
On = position in relation to another object (on the table)/ a place an object, a part of body as the recipient of an activity (top on shoulder)/ a means of support from beneath (supported on pillars)/ time of specific days (on Monday, on Asar 27th)/ the subject of a book, article, talk, lecture (article on ‘Human Rights’).
Opposite = on the side opposed to and facing. (His house is opposite of mine).
Out of = from within, inside/ beyond, (out of pocket/ out of control).
Over = directly above/ above and covering/ above in state and position/ finish/ across.
Since = from some specific time and up to the present.
Through = penetration/ point/ space by which sth. passes/ from the beginning to end.
Till = up to specific time or event/ before specific time or event.
To = in direction of / destination/ a point of arrival/ relation between two person or thing.
Next to = by the side/ near to (touching)
Pass = to go forward by place or thing
Under = beneath / at the foot of or close against/in control within authority/ less than in status of position.

Examples:

1. Fill the following gaps with in, on, or at:
(a) There is a ticket machine …………… the entrance to the car park. [Ans: at]
(b) In summer, there are always flies ………….. the kitchen ceiling. [Ans: on]
(c) Have you got blankets ………… your bed? [Ans: on]
(d) I have only got a pillow…………. mine. [Ans: in]

2. Fill in the blanks with in, on or at”.
(a) Have you got an electric blanket …….. your bed? I have got a hot-water-bottle …… mine.
(b) There is a ticket machine ……….. the entrance to the car park.
(c) Kathmandu is situated ……….. Baghmati zone.
(d) …………. summer, there are always flies ………. the kitchen ceiling
Answers:
(a) Have you got an electric blanket on your bed? I have got a hot-water-bottle in mine.
(b) There is a ticket machine at the entrance to the car park.
(c) Kathmandu is situated in Baghmati zone.
(d) In summer, there are always flies on the kitchen ceiling

3. Fill in the blanks using the best word from the brackets.
(a) There are fish swimming……….(in/on/at) the river.
(b) There are some goats………(in/on/at)that field.
(c) Lahan is ……….(in/on/at) the Mahendra Highway.
(d) There is some writing ………..(in/on/at)the wall.
(e) The Maldives are……….(on/in/at) the Indian Ocean.
Answers:
(a) There are fish swimming in the river.
(b) There are some goats in that field.
(c) Lahan is on the Mahendra Highway.
(d) There is some writing on the wall.
(e) The Maldives are in the Indian Ocean.

4. Complete the following sentences by filling blanks with the best word from brackets.
(a) Rita walked……….(through/ between /across) the door.
(b) The dog ran………. (through/between/across) the road.
(c) The students fell……….(down/off/between) the wall.
(d) The river flows ………….(under/between/along) the bridge.
(e) The women cycled………(through/down/out of ) the hill.
Answers:
(a) Rita walked through the door.
(b) The dog ran across the road.
(c) The students fell off the wall.
(d) The river flows under the bridge.
(e) The women cycled down the full.

Exercises:

1. Fill in the blanks with the best words from the brackets.
(a) Sarah sat ………….. (at/in/of) the library.
(b) Everyone drank tea……………….marry (also/and/but)
(c) The book is ……………..(at /in/on) floor.
(d) Most…………..(in /of/for) the students arrived on time.
(e) The coat is …………..(in/of/for) my sister.

2. Fill in the blanks with appropriate prepositions.
(a) Rita walked …… (through/ between/ across) the door.
(b) The dog ran ……. (through/ between/ across) the road.
(c) The students fell …… (off/ down/ between) the wall.
(d) The river flows ……. (under/ between/ along) the bridge.
(e) The woman yelled ……. (though/ down/ out of) the hill.

3. Fill in the blanks with appropriate prepositions.
(a) Mona was born …………..Tuesday, 15 July.
(b) What will happen………….the 22md century?
(c) You must take ……………your shoes before entering the temple
(d) You must pay your bills …………the end of June.
(e) Don’t throw rubbish out…………….the window.

4. Fill in the gaps with in, on, at, to:
(a) She was standing ………the entrance…….the car park.
(b) There’s a newspaper shop…………my way to the office.
(c) She spent the day sunbathing ……………the swimming pool.
(d) There are some cows…………that field.