Identify the singular subject pronoun in the sentences given below:
Shall I leave now, otherwise I will get late.

The correct answer is: I

'I' is the singular subject pronoun. The pronouns 'I' and 'we' are personal pronouns of the first person. 'I' is the singular first-person subject pronoun, whereas 'we' is the plural first-person subject pronoun. Therefore, 'I' is the correct answer.