Select the option that will improve the highlighted segment in the given sentence. In case no improvement is needed, select 'No improvement'.
Sitab has learnt how to cook really well as he regularly watching YouTube videos.

Correct option is D

The correct substitution of the highlighted words is (d) watches.
Explanation: The sentence uses present perfect tense ("has learnt"), and it describes a regular habit in the present. So the verb form "watches" (simple present tense) is appropriate to show a habitual action.
Grammatical rule used:
· When describing regular or habitual actions, use simple present tense: Subject + base verb + s/es (for third person singular).
· "He" is third person singular → use "watches" (not "watch" or "watching").
Example:
Incorrect: He regularly watching tutorials.
Correct: He regularly watches tutorials.
Information Booster:
· "Watching" is a present participle (used in continuous tenses or as a gerund)
· "Watch" is base form, suitable with modals or in imperative
· "Will watch" indicates future, which doesn’t fit here as the action is habitual.