Question

Fill in the blanks with the appropriate option:
The teacher is standing _____ the board
a) On
b) in
c) of
d) at

Answer 1

Hint: We have to use a preposition to show the relation between the teacher and the board because prepositions show the relation between the subject and object in a sentence. Therefore, using the given sentence we have to find out the preposition to be used to show the relation between the teacher and the board.

Complete answer:
 Option a is wrong because the teacher cannot stand on the board. To stand on something means to be standing upon it, for example, the cat sat on the mat which means that the cat was sitting on top of the mat.
Option b is wrong because a teacher cannot stand in the board. The word in is used to to define a relation when the subject is inside the object, for example, she kept the balls in the box which means the balls were inside the box.
Option c is wrong because the teacher is standing of the board makes no sense. The preposition of is usually used in sentences like The dress is made of silk.
The correct option is option d which says the teacher is standing at the board. It means that the teacher is standing near the board. Some other examples are The people standing at the bus stand. The word at is used to denote a position.

Note:
Always use prepositions given in the options in sentences of your own if you are confused about the given sentence. If you can find out the relation between the object and the subject of the sentence, then you can easily identify the preposition.