Select the correct expression to complete the sentence:- It _____ sin…

The correct answer is Option (1) → has been raining

Present perfect continuous tense:

• It is used for an action that began in the past and is still going on now.
• Pattern: has/have + been + verb-ing
  • Time marker: "since morning" gives the starting point of the action.
  • Subject: "It" is singular, so the helping verb is has.

Complete sentence: It has been raining since morning.

Why the Other Options are Incorrect?

Option 2: has raining — Incorrect. "Has" cannot be followed directly by a verb-ing form. The word been is missing.

Option 3: will raining — Incorrect.

• "Will" is followed by the base form (will rain), not a verb-ing form.
• The future does not fit an action that began "since morning".

Option 4: rain — Incorrect.

• "It rain" breaks subject-verb agreement (it rains).
• The simple present cannot show an action continuing from a point in the past.

Contrast: “has been raining” shows an action that began in the past and is still going on. “Will rain” looks to the future, and the simple present cannot show an action continuing from a point in the past.