Complete the following sentence by using a suitable question tag:

I can do it for you, _______

can't I?

The suitable question tag to complete the sentence is:  OPTION 4 "can't I?"

Explanation:

1. Matching Pronoun:

   • The pronoun in the question tag should match the pronoun in the statement. Here, "I" in the statement corresponds to "I" in "can't I?"

2. Negative Form:

   • The main clause is positive ("I can do it for you"), so the question tag needs to be in the negative form to create balance and seek confirmation.

3. Modal Verb Agreement:

   • The modal verb in the question tag ("can't") corresponds to the modal verb in the statement ("can").