Identify the correct tense form of the highlighted part in the given sentence.
They have been building the house for several years now.

Correct option is C

The correct tense of the highlighted part is (c) Present Perfect Continuous.
Explanation:
· The structure “have been + verb-ing” indicates Present Perfect Continuous Tense.
· This tense shows:
· An action that started in the past
· Continued over a period of time
· Is still ongoing at present
· The phrase “for several years now” strongly signals duration.
Structure Used:
Subject + have/has been + V-ing + time expression
Example:
She has been preparing for the exam for months.
Why other options are incorrect:
· (a) Present Continuous does not show long duration.
· (b) Present Perfect does not emphasize continuity.
· (d) Past Continuous refers only to past time, not continuing till now.