Question

(a) If you are wanting to watch (b) the birds nesting (c) you must not let them see you.

• A. (a)
• B. (b)
• C. (c)
• D. No error

Answer 1

The correct option is A (a)

The option with the error is the correct option.
Option A: The error lies in the word 'wanting' in "If you are wanting to watch". 'Want' is a stative verb that expresses a desire or wish.
(Verbs that express a state or emotion are called stative verbs. They usually relate to thoughts, emotions, states of being and so on.)
These verbs are usually not used in the present continuous tense, ending in an -ing. They must be used in the simple present tense. (In some situations, 'wanting' is used as an adjective). Hence option A is the correct option with the error.
Option B: "the birds nesting" has no error in it, 'nesting' is a participle that refers to the action of nesting. Hence B is incorrect.
Option C: "you must not let them see you" also has no error, hence C is incorrect.
Option D is incorrect because the error lies in A.