Question

Fill in the blank using suitable form of verb:
I knew Sarah was very busy, so I ________ her. (Disturb)
A) Didn’t disturb
B) Haven’t disturbed
C) Don’t disturb
D) Isn’t disturbing

Answer 1

Hint:First we must read all the given options and we must know the usage of the words. Later we must know the usage of the different words. Choose the option which will be grammatically correct. Also we must see that the selected option will make the sentence meaningful.

Complete step-by-step answer:
Now let’s examine and understand the given options above.
Haven’t disturbed: this option is the part of present perfect tense but the second phase of given sentence is past indefinite tense so it is absolutely wrong to use the ‘verb’ of present perfect tense. This option can’t be appropriate.
Don’t disturb: this option is the part of present indefinite tense but the second phase of given sentence is past indefinite tense so it is absolutely wrong to use the ‘verb’ of present indefinite tense. This option can’t be appropriate.
Isn’t disturbing: this option is the part of past continuous tense and “is” can’t be used with ‘I’ but the second phase of given sentence is past indefinite tense so it is absolutely wrong to use the ‘verb’ of past continuous tense. This option can’t be appropriate.
Didn’t disturb: this option [A] is the part of past indefinite tense which is absolutely appropriate because the second phase of a given sentence is past indefinite tense. So the correct sentence is “I knew Sarah was very busy, so I didn’t disturb her”.

Note:To understand such questions the study of tenses is required so that we can write correct sentences using appropriate verbs.
Verbs are the words which are used to describe an action, state, etc.
Tenses help in representing the time reference with reference to the time of speaking.
There are 12 kinds of tenses.