Question

Fill in the blank with the most appropriate word.
We waited _______ the plane took off.
a) as soon as
b) when
c) as
d) until

Answer 1

Hint: A preposition is a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word.

Complete answer:
In the given question, we have to find out which of the options given to us indicates that ‘we’ had waited right till the time the plane took off.
Let us thus analyze the options given to us in this question-
Option (a.), 'as soon as', is defined as ‘at the moment when; immediately after’.
Therefore, option (a.) is incorrect as this does not indicate that the subject (we) waited right till when the plane took off.
Option (b.), ‘when', is defined as ‘at what time; as soon as’. Therefore, option (b.) is incorrect as this does not indicate that the subject (we) waited right till when the plane took off.
Option (c.), ‘as', is defined as ‘at the same instant that; when’. Therefore, option (c.) is incorrect as this does not indicate that the subject (we) waited right till when the plane took off.
Option (d.), ‘until', is defined as ‘up to the time that (a condition becomes true)’. Therefore, option (d.) is incorrect as it perfectly describes how the subject (we) waited right till when the plane took off.

Note:
In this question, it will be helpful for the student to recall the concept of conjugation. Conjugation is a class of verbs having the same inflectional forms. It is the complete set of inflected forms of a verb.